Desmond 40cm Camera 16" Bar DRB-40 Double Dovetail Rail Arca RRS Compatible Compare to RRS CB-18. Compatible with all Arca style clamps, including RRS Lever Clamps. 100% Compatible with RRS Bars & Connectors. Features 6 x 1/4" threaded sockets and 1 x 3/8" threaded socket. Length: 40cm (15.75").