The W.Y. International Universal Heavy Duty Brake Lathe Adapter fits any 1-7/8” or 2” Arbor Brake Lathe. The Heavy Duty Brake Lathe Adapter provides quick error free set-up on heavy duty (truck/ bus) hub-less drums and rotors, with proven, patented precision mounting and machining accuracy, according to the company.The complete kit eliminates the need for various centering cones and clamping cups. With its three expanding jaws and heavy duty backing plates, four pieces do the work of many with a range that adapts drums and rotors with large center hole diameters of 5.275” to 10.2”