Desmond brand 25mm DAC-25 Arca-Swiss compatible Quick Release Clamp. Very versatile Jaw opening range of 37.5mm to 42.5mm will accommodate any Arca style plate from various makers including: Really right stuff (RRS), Wimberley, Arca-Swiss, Kirk Enterprises, Markins, etc. Includes 3 Strap Bosses. 3/8" Standard thread will fit on any standard tripod or head. 1/4" steel bushing adapter (included) converts it to 1/4" thread. All metal construction 25mm (1") in Length. Weighs 37g (1.3oz). Compatible with all Arca Swiss style plates.