Plumers and electricans rely on Milwaukee's Selfeed Bits for large hole drilling in wood. Features: Milwaukee 48-25-2252 2-1/4" Selfeed Bit The inside cutting plane shaves the hole radius for clean smooth holes without pressure A removable, replaceable feed screw draws the bit into the gummiest of woods effortlessly A 7/16" hex shank provides a secure gripping surface for the drill chuck The bit is coated with a rust inhibitor 2-1/4 in. bit diameter Cutting edges can be resharpened