Desmond brand Arca compatible DDSC-60 60mm Discal (circular) Clamp Offset Bubble Level has 3 mounting positions. Very versatile Jaw opening range of 37mm to 41.5mm will accommodate any Arca style plate from various makers including: Really right stuff (RRS), Wimberley, Jobu Design, Arca ., Kirk Enterprises, Markins, etc. Can be used on virtually any head, tripod or monopod. Very versatile, you can mount it to any 3/8"-16 post or 1/4"-20 (using the included 1/4" bushing adapter). Will fit many brands of ball heads & including Arca, RRS etc. Mounting hole 3/8" threaded. Diameter: 60mm. Length: 91mm. Height: 14.5mm. Weight: 96g (3.4oz). All metal construction, no rubber or plastic. Includes bubble level and allen wrench.