The Easy Jaws system 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 jaw, and slide the jaw right out. These jaws are excellent for small projects and bowls or platters up to 8". Jaws length is 7/16", and jaws will grip 1-3/8" straight tenons and expand out to 2".