Combo Rail DLR-2502B + Vertical DAC-25 Clamp Desmond 250mm Macro Arca-Swiss Compatible All Metal (aluminum) Construction No Rubber or Plastic Parts. Compatible with all Arca style clamps, including RRS Lever Clamps. Includes bubble Level & precision decimal scale. Weight: 242g Includes 1/4" screw, 4 x 4mm Dowel screws, 2 x 1/4" hex screws, 2 x safety screws and 2 allen wrenches.