Desmond 71cm Camera 28" Bar DRB-71 Double Dovetail Rail Arca RRS Compatible Compare to RRS CB-28. 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: 71.1cm (28").