Included in this bundle is a RAM Mount RAP-B-201U-A small composite 1 inch ball socket arm and an Arkon 1 inch ball to 17mm Garmin G-Ball adapter. This will allow you to use most Garmin automotive products with a RAM Mount. The adapter will fit all Garmin 17mm Ball Cradle Mount Adapters

If you need a longer double socket (3"), click 

A tightening screw on the side of the arm enables the sockets to clamp firmly to a RAM 1" diameter ball. When loosening the side screw, a single spring inside the arm opens the sockets allowing you to pivot the ball and socket connection or completely disconnect the ball from the socket.

The arm length is 1.75" when measured from socket center to socket center. The total length of the arm is 2.38".