Desmond DAC-3838 38mm Flush Mount QR Clamp 3/8" Screw Hole & 1/4" Adapter & 3 Strap Bosses All Metal (aluminum) Construction No Rubber or Plastic Parts. will accommodate any Arca style plate from various makers including: Really right stuff (RRS), Wimberley, Arca Swiss, Kirk Enterprises, Markins, etc. 38mm (1.5") Long. 3/8" threaded w 1/4" Steel Adapter. Features RRS / Arca compatible dovetail groove.