Haoge 50mm QR Quick Release Plate and D-Ring Screw Fits Arca-Swiss Standard for Tripod Ball Head Compatible with a variety of digital cameras. With 39mm AS standard interface, compatible with all Acra-Swiss Style quick release platforms. Two safety stop screws in both side to prevent drop of camera by accident. 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.