Quickgrip Action Head with 1/4-20 Quick-Release Plate Single locking mechanism for quick, easy and intuitive camera positioning. Two-tiered adjustable ball-tension control for a variety of camera and lens sizes and camera setups Secondary security lock prevents accidental release of quick-release plate and camera from head Quick-release plate with 1/4-20 thread makes mounting your camera a breeze For SLR cameras with zoom lenses and lightweight medium format cameras