The W.Y. International Heavy Duty Truck/Bus Three Jaw Chuck Adapter, No. 60040K3, fits any 1-7/8” or 2” arbor brake lathe. The adapter provides quick, error-free setup on heavy duty hubless drums and rotors with with large center hole diameters of 5.275” to 10.2”. The complete kit eliminates the need for various centering cones and clamping cups. The four-piece kit includes expanding jaws and three heavy duty backing plates.