This extension accessory keeps your fingers in a comfortable position to assure secure hold as you grip the camera body. It is easy to attach and detach by turning a screw with a handle. This grip extender is designed for the Sony Alpha A9 Digital Camera. Specifications: Dimensions (W x H x D): Approx. 95 x 56 x 21 mm (3 3/4 x 2 1/4 x 27/32 inches). Weight: Approx. 73 g (2.6 oz).