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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. Removable and replaceable feed screw for longer life. Cutting edges can be resharpened. Two feed screws are included.