Frame your subjects and focus your camera with ultimate precision using the ProMaster MR1 Macro Focusing Rail. Its X/Y design gives you the freedom to move your camera front to back and side to side using gear-driven controls. Lock-down knobs keep your camera steady when you are ready to press the shutter button. The MR1 features the ProMaster dovetail quick release system (compatible with arca-swiss type dovetail products) for rapid attachment to a tripod (with matching receiver) as well as your camera. Features Dovetail quick release system for both tripod and camera attachments Includes 1 camera quick release camera plate 1/4-20 tripod mounting hole in base for alternative tripod attachment Camera QR receiver orientation can be change in 90 degree increments Scales on both aces for precise positioning Solid aluminum construction Specifications: Dimensions: 185mm L x 165mm W x 89mm H Weight: 1 lb 7 oz. / .65 kg