Extend your reach 5-1/2 in when drilling with Milwaukee® selfeed bits, auger bits and hole saws. Accepts all 7/16 in hex, secures with a hex key included. The 7/16 in hex fits both 3-jawed chucks, 1/2 in drill capacity and larger, as well as 7/16 in quick-change chucks. Milwaukee® Bit Extension, 7/16 in Shank, 5-1/2 in Length, Alloy Steel, For Use With: Self-Feed Bits, Auger Bit and 1 in Dia and Larger with 7/16 in Shank Hole Saw