diff --git a/riva/client/argparse_utils.py b/riva/client/argparse_utils.py
index d662697f..a8cc1a72 100644
--- a/riva/client/argparse_utils.py
+++ b/riva/client/argparse_utils.py
@@ -3,6 +3,20 @@
 
 import argparse
 
+def validate_grpc_message_size(value):
+    """Validate that the GRPC message size is within acceptable limits."""
+    min_size = 4 * 1024 * 1024  # 4MB
+    max_size = 1024 * 1024 * 1024  # 1GB
+
+    try:
+        size = int(value)
+        if size < min_size:
+            raise argparse.ArgumentTypeError(f"GRPC message size must be at least {min_size} bytes (4MB)")
+        if size > max_size:
+            raise argparse.ArgumentTypeError(f"GRPC message size must be at most {max_size} bytes (1GB)")
+        return size
+    except ValueError:
+        raise argparse.ArgumentTypeError(f"'{value}' is not a valid integer")
 
 def add_asr_config_argparse_parameters(
     parser: argparse.ArgumentParser, max_alternatives: bool = False, profanity_filter: bool = False, word_time_offsets: bool = False
@@ -102,13 +116,16 @@ def add_asr_config_argparse_parameters(
 
 def add_connection_argparse_parameters(parser: argparse.ArgumentParser) -> argparse.ArgumentParser:
     parser.add_argument("--server", default="localhost:50051", help="URI to GRPC server endpoint.")
-    parser.add_argument("--ssl-cert", help="Path to SSL client certificates file.")
+    parser.add_argument("--ssl-root-cert", help="Path to SSL root certificates file.")
+    parser.add_argument("--ssl-client-cert", help="Path to SSL client certificates file.")
+    parser.add_argument("--ssl-client-key", help="Path to SSL client key file.")
     parser.add_argument(
         "--use-ssl", action='store_true', help="Boolean to control if SSL/TLS encryption should be used."
     )
     parser.add_argument("--metadata", action='append', nargs='+', help="Send HTTP Header(s) to server")
+    parser.add_argument("--options", action='append', nargs='+', help="Send GRPC options to server")
     parser.add_argument(
-        "--max-message-length", type=int, default=64 * 1024 * 1024, help="Maximum message length for GRPC server."
+        "--max-message-length", type=validate_grpc_message_size, default=64 * 1024 * 1024, help="Maximum message length for GRPC server."
     )
     return parser
 
diff --git a/riva/client/auth.py b/riva/client/auth.py
index 046f409d..4ee70854 100644
--- a/riva/client/auth.py
+++ b/riva/client/auth.py
@@ -8,23 +8,34 @@
 
 
 def create_channel(
-    ssl_cert: Optional[Union[str, os.PathLike]] = None,
+    ssl_root_cert: Optional[Union[str, os.PathLike]] = None,
+    ssl_client_cert: Optional[Union[str, os.PathLike]] = None,
+    ssl_client_key: Optional[Union[str, os.PathLike]] = None,
     use_ssl: bool = False,
     uri: str = "localhost:50051",
     metadata: Optional[List[Tuple[str, str]]] = None,
-    max_message_length: int = 64 * 1024 * 1024,
+    options: Optional[List[Tuple[str, str]]] = [],
 ) -> grpc.Channel:
     def metadata_callback(context, callback):
         callback(metadata, None)
 
-    options = [('grpc.max_receive_message_length', max_message_length), ('grpc.max_send_message_length', max_message_length)]
-    if ssl_cert is not None or use_ssl:
+    if ssl_root_cert is not None or ssl_client_cert is not None or ssl_client_key is not None or use_ssl:
         root_certificates = None
-        if ssl_cert is not None:
-            ssl_cert = Path(ssl_cert).expanduser()
-            with open(ssl_cert, 'rb') as f:
+        client_certificates = None
+        client_key = None
+        if ssl_root_cert is not None:
+            ssl_root_cert = Path(ssl_root_cert).expanduser()
+            with open(ssl_root_cert, 'rb') as f:
                 root_certificates = f.read()
-        creds = grpc.ssl_channel_credentials(root_certificates)
+        if ssl_client_cert is not None:
+            ssl_client_cert = Path(ssl_client_cert).expanduser()
+            with open(ssl_client_cert, 'rb') as f:
+                client_certificates = f.read()
+        if ssl_client_key is not None:
+            ssl_client_key = Path(ssl_client_key).expanduser()
+            with open(ssl_client_key, 'rb') as f:
+                client_key = f.read()
+        creds = grpc.ssl_channel_credentials(root_certificates=root_certificates, private_key=client_key, certificate_chain=client_certificates)
         if metadata:
             auth_creds = grpc.metadata_call_credentials(metadata_callback)
             creds = grpc.composite_channel_credentials(creds, auth_creds)
@@ -37,23 +48,58 @@ def metadata_callback(context, callback):
 class Auth:
     def __init__(
         self,
-        ssl_cert: Optional[Union[str, os.PathLike]] = None,
+        ssl_root_cert: Optional[Union[str, os.PathLike]] = None,
         use_ssl: bool = False,
         uri: str = "localhost:50051",
         metadata_args: List[List[str]] = None,
-        max_message_length: int = 64 * 1024 * 1024,
+        ssl_client_cert: Optional[Union[str, os.PathLike]] = None,
+        ssl_client_key: Optional[Union[str, os.PathLike]] = None,
+        options: Optional[List[Tuple[str, str]]] = [],
     ) -> None:
         """
-        A class responsible for establishing connection with a server and providing security metadata.
+        Initialize the Auth class for establishing secure connections with a server.
+
+        This class handles SSL/TLS configuration, authentication metadata, and gRPC channel creation
+        for secure communication with Riva services.
 
         Args:
-            ssl_cert (:obj:`Union[str, os.PathLike]`, `optional`): a path to SSL certificate file. If :param:`use_ssl`
-                is :obj:`False` and :param:`ssl_cert` is not :obj:`None`, then SSL is used.
-            use_ssl (:obj:`bool`, defaults to :obj:`False`): whether to use SSL. If :param:`ssl_cert` is :obj:`None`,
-                then SSL is still used but with default credentials.
-            uri (:obj:`str`, defaults to :obj:`"localhost:50051"`): a Riva URI.
+            ssl_root_cert (Optional[Union[str, os.PathLike]], optional): Path to the SSL root certificate file.
+                If provided and use_ssl is False, SSL will still be enabled. Defaults to None.
+            use_ssl (bool, optional): Whether to use SSL/TLS encryption. If True and ssl_root_cert is None,
+                SSL will be used with default credentials. Defaults to False.
+            uri (str, optional): The Riva server URI in format "host:port". Defaults to "localhost:50051".
+            metadata_args (List[List[str]], optional): List of metadata key-value pairs for authentication.
+                Each inner list should contain exactly 2 elements: [key, value]. Defaults to None.
+            ssl_client_cert (Optional[Union[str, os.PathLike]], optional): Path to the SSL client certificate file.
+                Used for mutual TLS authentication. Defaults to None.
+            ssl_client_key (Optional[Union[str, os.PathLike]], optional): Path to the SSL client private key file.
+                Used for mutual TLS authentication. Defaults to None.
+            options (Optional[List[Tuple[str, str]]], optional): Additional gRPC channel options.
+                Each tuple should contain (option_name, option_value). Defaults to [].
+
+        Raises:
+            ValueError: If any metadata argument doesn't contain exactly 2 elements (key-value pair).
+
+        Example:
+            >>> # Basic connection without SSL
+            >>> auth = Auth(uri="localhost:50051")
+
+            >>> # SSL connection with custom certificate
+            >>> auth = Auth(
+            ...     use_ssl=True,
+            ...     ssl_root_cert="/path/to/cert.pem",
+            ...     uri="secure-server:50051"
+            ... )
+
+            >>> # Connection with authentication metadata
+            >>> auth = Auth(
+            ...     metadata_args=[["api-key", "your-api-key"], ["user-id", "12345"]],
+            ...     uri="auth-server:50051"
+            ... )
         """
-        self.ssl_cert: Optional[Path] = None if ssl_cert is None else Path(ssl_cert).expanduser()
+        self.ssl_root_cert: Optional[Path] = None if ssl_root_cert is None else Path(ssl_root_cert).expanduser()
+        self.ssl_client_cert: Optional[Path] = None if ssl_client_cert is None else Path(ssl_client_cert).expanduser()
+        self.ssl_client_key: Optional[Path] = None if ssl_client_key is None else Path(ssl_client_key).expanduser()
         self.uri: str = uri
         self.use_ssl: bool = use_ssl
         self.metadata = []
@@ -65,7 +111,7 @@ def __init__(
                     )
                 self.metadata.append(tuple(meta))
         self.channel: grpc.Channel = create_channel(
-            self.ssl_cert, self.use_ssl, self.uri, self.metadata, max_message_length=max_message_length
+            self.ssl_root_cert, self.ssl_client_cert, self.ssl_client_key, self.use_ssl, self.uri, self.metadata, options=options
         )
 
     def get_auth_metadata(self) -> List[Tuple[str, str]]:
diff --git a/scripts/asr/riva_streaming_asr_client.py b/scripts/asr/riva_streaming_asr_client.py
index 43873942..f600af66 100644
--- a/scripts/asr/riva_streaming_asr_client.py
+++ b/scripts/asr/riva_streaming_asr_client.py
@@ -50,7 +50,15 @@ def streaming_transcription_worker(
 ) -> None:
     output_file = Path(output_file).expanduser()
     try:
-        auth = riva.client.Auth(args.ssl_cert, args.use_ssl, args.server, args.metadata)
+        auth = riva.client.Auth(
+            ssl_root_cert=args.ssl_root_cert,
+            ssl_client_cert=args.ssl_client_cert,
+            ssl_client_key=args.ssl_client_key,
+            use_ssl=args.use_ssl,
+            uri=args.server,
+            metadata_args=args.metadata,
+            options=args.options
+        )
         asr_service = riva.client.ASRService(auth)
         config = riva.client.StreamingRecognitionConfig(
             config=riva.client.RecognitionConfig(
diff --git a/scripts/asr/transcribe_file.py b/scripts/asr/transcribe_file.py
index f9cbd7c9..1849a675 100644
--- a/scripts/asr/transcribe_file.py
+++ b/scripts/asr/transcribe_file.py
@@ -66,7 +66,15 @@ def main() -> None:
     if args.list_devices:
         riva.client.audio_io.list_output_devices()
         return
-    auth = riva.client.Auth(args.ssl_cert, args.use_ssl, args.server, args.metadata)
+    auth = riva.client.Auth(
+        ssl_root_cert=args.ssl_root_cert,
+        ssl_client_cert=args.ssl_client_cert,
+        ssl_client_key=args.ssl_client_key,
+        use_ssl=args.use_ssl,
+        uri=args.server,
+        metadata_args=args.metadata,
+        options=args.options
+    )
     asr_service = riva.client.ASRService(auth)
 
     if args.list_models:
diff --git a/scripts/asr/transcribe_file_offline.py b/scripts/asr/transcribe_file_offline.py
index 8d1fd482..afedb957 100644
--- a/scripts/asr/transcribe_file_offline.py
+++ b/scripts/asr/transcribe_file_offline.py
@@ -33,7 +33,15 @@ def parse_args() -> argparse.Namespace:
 def main() -> None:
     args = parse_args()
 
-    auth = riva.client.Auth(args.ssl_cert, args.use_ssl, args.server, args.metadata)
+    options = [('grpc.max_receive_message_length', args.max_message_length), ('grpc.max_send_message_length', args.max_message_length)]
+    auth = riva.client.Auth(
+        ssl_root_cert=args.ssl_root_cert,
+        ssl_client_cert=args.ssl_client_cert,
+        ssl_client_key=args.ssl_client_key,
+        use_ssl=args.use_ssl,
+        uri=args.server,
+        metadata_args=args.metadata,
+        options=options)
     asr_service = riva.client.ASRService(auth)
 
     if args.list_models:
diff --git a/scripts/asr/transcribe_mic.py b/scripts/asr/transcribe_mic.py
index 77d38fb3..3fd2b5a2 100644
--- a/scripts/asr/transcribe_mic.py
+++ b/scripts/asr/transcribe_mic.py
@@ -45,7 +45,15 @@ def main() -> None:
     if args.list_devices:
         riva.client.audio_io.list_input_devices()
         return
-    auth = riva.client.Auth(args.ssl_cert, args.use_ssl, args.server, args.metadata)
+    auth = riva.client.Auth(
+        ssl_root_cert=args.ssl_root_cert,
+        ssl_client_cert=args.ssl_client_cert,
+        ssl_client_key=args.ssl_client_key,
+        use_ssl=args.use_ssl,
+        uri=args.server,
+        metadata_args=args.metadata,
+        options=args.options
+    )
     asr_service = riva.client.ASRService(auth)
     config = riva.client.StreamingRecognitionConfig(
         config=riva.client.RecognitionConfig(
diff --git a/scripts/nlp/punctuation_client.py b/scripts/nlp/punctuation_client.py
index ab843a77..437cce21 100644
--- a/scripts/nlp/punctuation_client.py
+++ b/scripts/nlp/punctuation_client.py
@@ -39,7 +39,15 @@ def parse_args() -> argparse.Namespace:
 
 
 def run_punct_capit(args: argparse.Namespace) -> None:
-    auth = riva.client.Auth(args.ssl_cert, args.use_ssl, args.server, args.metadata)
+    auth = riva.client.Auth(
+        ssl_root_cert=args.ssl_root_cert,
+        ssl_client_cert=args.ssl_client_cert,
+        ssl_client_key=args.ssl_client_key,
+        use_ssl=args.use_ssl,
+        uri=args.server,
+        metadata_args=args.metadata,
+        options=args.options
+    )
     nlp_service = riva.client.NLPService(auth)
     if args.interactive:
         while True:
@@ -134,7 +142,15 @@ def run_tests(args: argparse.Namespace) -> int:
         ],
     }
 
-    auth = riva.client.Auth(args.ssl_cert, args.use_ssl, args.server, args.metadata)
+    auth = riva.client.Auth(
+        ssl_root_cert=args.ssl_root_cert,
+        ssl_client_cert=args.ssl_client_cert,
+        ssl_client_key=args.ssl_client_key,
+        use_ssl=args.use_ssl,
+        uri=args.server,
+        metadata_args=args.metadata,
+        options=args.options
+    )
     nlp_service = riva.client.NLPService(auth)
 
     fail_count = 0
diff --git a/scripts/nmt/nmt.py b/scripts/nmt/nmt.py
index a978cc9b..f3d13dbe 100644
--- a/scripts/nmt/nmt.py
+++ b/scripts/nmt/nmt.py
@@ -123,7 +123,15 @@ def request(inputs,args):
 
     args = parse_args()
 
-    auth = riva.client.Auth(args.ssl_cert, args.use_ssl, args.server, args.metadata)
+    auth = riva.client.Auth(
+        ssl_root_cert=args.ssl_root_cert,
+        ssl_client_cert=args.ssl_client_cert,
+        ssl_client_key=args.ssl_client_key,
+        use_ssl=args.use_ssl,
+        uri=args.server,
+        metadata_args=args.metadata,
+        options=args.options
+    )
     nmt_client = riva.client.NeuralMachineTranslationClient(auth)
 
     if args.list_models:
diff --git a/scripts/nmt/nmt_speech_to_speech.py b/scripts/nmt/nmt_speech_to_speech.py
index 49426bfe..7348525b 100644
--- a/scripts/nmt/nmt_speech_to_speech.py
+++ b/scripts/nmt/nmt_speech_to_speech.py
@@ -32,7 +32,15 @@ def main():
     if not os.path.exists(args.audio_file):
         raise FileNotFoundError(f"Input audio file not found: {args.audio_file}")
 
-    auth = riva.client.Auth(args.ssl_cert, args.use_ssl, args.server, args.metadata)
+    auth = riva.client.Auth(
+        ssl_root_cert=args.ssl_root_cert,
+        ssl_client_cert=args.ssl_client_cert,
+        ssl_client_key=args.ssl_client_key,
+        use_ssl=args.use_ssl,
+        uri=args.server,
+        metadata_args=args.metadata,
+        options=args.options
+    )
     nmt_client = riva.client.NeuralMachineTranslationClient(auth)
 
     if args.list_models:
diff --git a/scripts/nmt/nmt_speech_to_text.py b/scripts/nmt/nmt_speech_to_text.py
index 7d75a6c7..bc8c0f2a 100644
--- a/scripts/nmt/nmt_speech_to_text.py
+++ b/scripts/nmt/nmt_speech_to_text.py
@@ -43,7 +43,15 @@ def main():
     if not os.path.exists(args.audio_file):
         raise FileNotFoundError(f"Input audio file not found: {args.audio_file}")
 
-    auth = riva.client.Auth(args.ssl_cert, args.use_ssl, args.server, args.metadata)
+    auth = riva.client.Auth(
+        ssl_root_cert=args.ssl_root_cert,
+        ssl_client_cert=args.ssl_client_cert,
+        ssl_client_key=args.ssl_client_key,
+        use_ssl=args.use_ssl,
+        uri=args.server,
+        metadata_args=args.metadata,
+        options=args.options
+    )
     nmt_client = riva.client.NeuralMachineTranslationClient(auth)
 
     if args.list_models:
diff --git a/scripts/tts/talk.py b/scripts/tts/talk.py
index ac3ed6d0..2df233b0 100644
--- a/scripts/tts/talk.py
+++ b/scripts/tts/talk.py
@@ -99,8 +99,19 @@ def main() -> None:
         riva.client.audio_io.list_output_devices()
         return
 
+    if args.options is None:
+        args.options = []
+    args.options.append(('grpc.max_receive_message_length', args.max_message_length))
+    args.options.append(('grpc.max_send_message_length', args.max_message_length))
+
     auth = riva.client.Auth(
-        args.ssl_cert, args.use_ssl, args.server, args.metadata, max_message_length=args.max_message_length
+        ssl_root_cert=args.ssl_root_cert,
+        ssl_client_cert=args.ssl_client_cert,
+        ssl_client_key=args.ssl_client_key,
+        use_ssl=args.use_ssl,
+        uri=args.server,
+        metadata_args=args.metadata,
+        options=args.options
     )
     service = riva.client.SpeechSynthesisService(auth)
     nchannels = 1