PSI Woodworking Products CSCBARR4 Barracuda4 Powergrip Key Chuck Chuck body threaded 1-1/2-Inch by 8TPI, with optional adapters to 1-Inch by 8TPI, 1-1/4-Inch by 8TPI, M33 by 3.5 mm Comes with 4 sets of jaws: 1 Step jaws, 2 Round jaws, 3 Wide jaws and Pin jaws Screw chuck insert for bowl turning Long shaft chuck key, "T" handled Allen wrench 4-1/2-Inch diameter, 8 lb body-all components are packaged in a wood carrying case