Easy Wood Tools CJ450 3-1/2" Easy Stepped Dovetail Jaws for Easy Chuck Allows quick and effortless changing of chuck jaws from one set to another in less than 30 seconds . The 3  Easy Stepped Dovetail Jaws are perfect for large bowl and platters up to 20" in diameter Grips a 2 1/2, 3" and 3 1/2" tenons, expands to 4 1/4 and has a jaw length of 1" Sale includes set of 4 jaws only. Easy Chuck not included