5 Pack Desmond DAC-01 50mm QR Clamp 3/8" w 1/4" Adapter Arca Compatible for Tripod Head 5 pack of 50mm Clamps will accommodate any Arca style plate from various makers including: Really right stuff (RRS), Wimberley, Jobu Design, Arca Swiss, Kirk Enterprises, Markins, etc. 50mm (1.97") in Length. 3/8"-16 thread with metal 1/4"-20 Adapter Includes Bubble Level