Safety stops at the front and back of our plates keep your expensive lens from accidentally slipping out of the quick-release clamp. If you wish to use only one or neither of these stops, simply remove them with the hex key provided. Our plates are designed to accept RRS & Kirk flash brackets as well as our own quick-release flash brackets. Our unique double-dovetail design allows you to attach Wimberley quick-release flash brackets to the upper or lower surface of the plate.