Desmond brand DSP-1 : Arca-Swiss compatible QR plate. Sliding Backstop will fit a variety of cameras. 50mm (2") Wide. 1 x 1/4"-20 screw (with both flat head screwdriver slot & 4mm hex socket) All metal (aluminum). Includes 2 x 2.5mm hex safety screws on the underside. Includes 2.5mm and 4mm allen wrenches. Perfect fit for RRS Lever Clamps. Weight: 1.5oz (43g).