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Product Description The large diameter end bores holes to allow nail or screw heads to enter the slot, and the smaller diameter allows room for the shank of the nail or screw. 25/64" Overall Dia (D), 3/16" Small Dia (n), 7/16" Carbide Height (h), 1/4" Shank, 1-5/8" Overall Length (H), 1/4" Minor Height (m) Ideal For: Cut openings in siding & paneling. Application: Key holes for hanging plaques and shelves. Made In Italy. From the Manufacturer This solid carbide bit creates key holes for hanging plaques and shelves. The large diameter end cuts a hole to allow nail or screw heads to enter the slot created by the smaller diameter of the bit. Covered by Freud's limited lifetime warranty.