Neewer Black Metal PU-200 Universal Quick Release Plate Fits Arca-Swiss Standard for Tripod Ballhead (Screw Mount: 1/4" -Not Included) Material: Metal Alloy Mounting Screw Diameter: 1/4" (the screw size that connecting the QR plate and camera)(no included) Compatibility: Arca-Swiss Standard Advanced CNC (Computerized Numeric Control) machine systems provide precise dimension to fit perfectly. Special anti-slip rubber pads enhance the grip between each plate and the mounted gear, and protect the gear from any damage due to mounting.