Dimensions: 185mm L x 165mm W x 89mm HWeight: 1 lb 7 oz. / .65 kgFrame 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.