Desmond 200mm DLR-2002 Double Macro Rail Arca Compatible ideal for Vertical All Metal (aluminum) Construction No Rubber or Plastic Parts. Compatible with all Arca style clamps, including RRS Lever Clamps. Includes precision decimal scale. Weight: 133g Includes 2 x 1/4" hex screws, 2 x safety screws and 2 allen wrenches.