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. Under and over independent Arca clamps. Use it with 2 long plates or rails for precise dual control. Length: 50mm. Width (inc handles): 113mm. Height: 22mm. Weight: 118g. 3/8"-16 threaded mounting hole. Includes Stainless steel 1/4"-20 bushing adapter. All metal construction. Metal knobs with no rubber or plastic.