90&deg; Degree Double Right Angle Clamp Desmond Arca Compatible ideal for Panorama Panoramic D290 All Metal (aluminum) Construction No Rubber or Plastic Parts. will accommodate any Arca style rails from various makers including: Really right stuff (RRS), Wimberley, Sunwayfoto, Desmond, Arca Swiss, Kirk Enterprises, Markins, etc. Ideal for Panoramic rigs Jaws are 50mm (2") in Length. Weighs 159g (5.6oz).