This Benro QR-3 Quick Release Plate is for use with the KS-series of ball heads. Although this plate will fit into any KS-type head, due to its length, this plate is recommended for use with the larger KS-1 or KS-2 ballheads. It comes with a 1/4"-20 camera screw, and features rubber non-skid strips.
The QR-3 measures 50 x 70mm.