Universal, quick change with all brands of hole saws. Tool-free operation. No adapters required. Twist to release. Durable hardened steel construction. No. 49-56-7210: Shank Diameter: 3/8", Hole Size: Up to 1-3/16", For Use With: 1-3/16", Drill Chucks 3/8" and Larger, Pkg Qty: 1, Package Type: Clamshell Thanks for shopping Hipp Hardware Plus's Online Store for all your DIY and Home Improvement needs. Remember Hipps Help!