This is the grip for the Leica M6. It is part #14405. It adds a nice finger hold without adding much to the size or the weight of the camera. A small chrome key folds out on the bottom of the grip for attachment to the camera. It folds back flat for use. I purchased mine new for about $100 and thought that it was a bargain at the time. It really has a nice firm feel when attached to the camera and the baseplate can still be removed with the grip attached. If you like to carry the camera with the strap around your wrist the Leica grip gives you a little more feeling of security.