SUNWAYFOTO brand Arca compatible DDC-50L 50mm Screw Knob Clamp Very versatile Jaw opening range of 37.25mm 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. 3/8"mounting hole and 1/4" adapter. Can be used on virtually any head, tripod or monopod. Or remove your existing clamp and replace it using the 6mm hex screw provided. Will fit many brands of ball heads including Arca, RRS etc. Use included Metric 6 flat head screw to mount onto a ballhead. Length: 50mm. Width: 97mm. Height: 13mm. Weight: 76g. 3/8" Standard thread will fit on any standard tripod or head 1/4" brass bushing adapter (included) converts it to 1/4" thread. All metal construction. Includes bubble level, Safety grooves, and the accessories pictured.