The PU-60 Slide-In Quick Release Plate has a 1/4″-20 thread and is a spare or replacement part for B-1, B-2, & B-3 Ballheads and other Arca-Swiss compatible Quick Release clamps Specifications: The PU-60 quick release plate for Benro New generation B-1, J1 Ballhead. Safe Screw installed in both side to prevent drop of camera by accident. You can change the location of the screw to fit different cameras. The PU-60 Universal Quick Release System has been designed to be compatible with other brand quick release systems. Suitable for most ball heads. Built with excellent materials, offering outstanding quality. Material: Metal Alloy Color: Matt Black Length: 60mm Width: 38mm (universal width of Arca-Swiss Standard QR plates). Thickness: 10mm (universal thickness of Arca-Swiss Standard QR plates) Mounting Screw Diameter: 1/4″ (the screw size that connecting the QR plate and camera) Compatibility: Arca-Swiss Standard Package Including: 1 × PU60 Quick Release Plate. It is not comes with retail package