Extend your reach 5-1/2 inch when drilling with Milwaukee selfeed bits, auger bits and hole saws. Accepts all 7/16 inch hex, secures with a hex key included. The 7/16 inch hex fits both 3 jawed chucks, 1/2 inch drill capacity and larger, as well as 7/16 inch quick change chucks. 7/16 in. Hex shank5-1/2 in. lengthFor selfeed bits, auger bits and hole saw 1 in. diameter and larger with 7/16 in. shankExtends your reach when drillinghe 7/16 inch hex fits both 3 jawed chucks, 1/2 inch drill capacity and larger, as well as 7/16 inch Quick Change chucks