Big Easy Jaws from Easy Wood Tools utilize the patent pending Easy Jaw" system, which allows you to change from one set of jaws to another in 30 seconds or less. The patent pending Snap-Lock Technology uses no jaws screw or wrenches to exchange jaws. Simply use the supplied Jaw Key to depress the keeper latch in the master jaw slide, and remove and install the necessary jaw. These jaws are excellent for soft gripping small and large projects on lathes up to 20" swing by grabbing the rims of platters, bowls, and hollow forms. The urethane grippers will not mark or mar your projects. Big Easy Jaws Set includes: 1 set (4 pieces) of Easy Base Jaws, 1 set (4) Jaw Plates and mounting screws, (8) Easy Dovetail Grippers with mounting screws, and (1) 5/32" T-handle wrench.