Jacobs Chuck 31416 High Torque and Precision Keyless Drill Chuck with Integrated Shank， R8 Mount， 0.630" Maximum Capacity， 2-1/8" Diameter x 3-25/32" Closed Length<img src="http://ecx.images-amazon.com/images/I/31R%2BrjN1IVL.jpg" noproxy>