Desmond brand Arca compatible Rail w 37mm Clamp & Double Arca Dovetails DVC-220. Integral "on-end"clamp fits to all Arca standard quick release plates. Anodized to a scratch-resistant, black finish. Width (rail only): 39mm. Width (including handle): 73mm. Length (including clamp): 220mm. Length (without clamp): 200mm. Weight: 216g . Mounting hole: 1/4-20″. Clamp Style: Screw-Knob. 1. Precision machined from solid aircraft-grade aluminum. 2. Hard -anodized finish, durable and resists scratches. 3. Captive Knob. Knob stops at maximum opening. 4. Easy-recognized laser-engraved scale on both sides of the rail to adjust. the nodal point conveniently and accurately. 5. Safety stop screws included. 6. 16mm Bubble Level. All metal construction, knob is all metal with no rubber or plastic. Includes 2 allen wrenches 2 stop screws and 1/4" cap hex screw. RRS Lever Clamp compatible.