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This self feeding drill bit works perfectly for central vacuum pipe. 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 hex shank provides a secure gripping surface for the drill chuck. The bit is coated with a rust inhibitor. 2-9/16" bit diameter, 7/16 inch hex shank that fits 1/2" inch or larger drills.
