Desmond DVC-220 220mm Rail 90&deg; Arca Compatible w Vertical Clamp & Dual Dovetails 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. RRS Lever Clamp compatible. Includes 1 x 1/4" hex screws, 2 x safety screws and 2 allen wrenches.