SUNWAYFOTO brand Arca-Swiss compatible DDC-26 26mm Screw Knob Clamp 1/4" mounting hole. Very versatile Jaw opening range of 38mm to 41.5mm will accommodate any Arca style plate from various makers including:Really right stuff (RRS), Wimberley, Jobu Design, Arca Swiss, Kirk Enterprises,Markins, etc. Length: 26mm. Width: 53mm. Height: 15mm. Weight: 50g. All metal construction.Includes 5mm mounting screw & Allen Wrench.