The TY-LP75 Quick Release Plate from Sirui is an Arca-compatible plate designed for use with telephoto lenses with a support foot. It uses a dual mounting screw design to properly secure the lens. There is a ridge at the rear of the plate that helps keep the lens from turning if only one mounting screw is used. It has a safety lock design that prevents the plate from sliding off the head if the quick release clamp is loosened.