For a9, a7 II, a7R II, & a7S II Cameras, Extends Grip for Improved Comfort, Added Stability, Attaches to Camera's Tripod Socket, Aluminum Construction. Improve the comfort and stability of your a9 or a7 II series camera with the GP-X1EM Grip Extension from Sony. It mounts to the camera's tripod socket and provides a larger and taller grip for a more ergonomic shooting setup. Additionally it has a durable aluminum construction.