The Ball Head Enforced Quick Release System is a large "socket & ball" head that is strong enough to support the heaviest of professional SLR cameras. It has been carefully designed and manufactured to precisely position the camera easily and securely. Two separate knobs provide optimal security and convenience. In addition to the main locking knob, it also features a friction control knob, and a separate locking knob for pan control. The attached ball head professional is a clamp style quick release system that is compatible with plates that fit the Arca Swiss standard. It comes with horizontal and vertical bubble levels, and anti-twist reversible tabs on the plate to prevent slippage when using the head in a vertical position.