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 large projects such as hollow vessels, bowls, and platters up to 24". Jaws length is 1", and jaws will grip 3-1/2" tenons and expand out to 4 1/4".