Features: For woodworking, drill presses and CNC machines Jaws are special heat treated with good wear resistance and precision fitted to withstand excessive torque Internal bearings to give excessive runout, highly reliable and durable Each chuck 100% inspected for performance ...Features: For woodworking, drill presses and CNC machines Jaws are special heat treated with good wear resistance and precision fitted to withstand excessive torque Internal bearings to give excessive runout, highly reliable and durable Each chuck 100% inspected for performance and precision Fully hardened and ground working components provide exceptionally high accuracy & gripping power on all industrial power and machine tools Packaging - Cardboard box Specifications: Maximum capacity(in): 1/2" Minimum Capacity(in): 0.04" Mount: JT33 Runout(in): 0.007" Sleeve Diameter (in): 2.1"