This vintage custom Bolex pistol/hand grip does not come with a mounting screw. It has a custom attachment mounted on it. We do not know its intended purpose. The custom attachment is 5'' long and 1 1/4'' at its widest. It was originally intended for use with Bolex H8, H16, Leader, REX, and Reflex cameras. It has scuff marks, scratches, and finish loss on its exterior. It functions properly. Please see photos.