Using the highest quality sub-micrograin carbide These bits have a special proprietary edge processing system featuring a super high polished cutting edge with a unique “mirror finish” Resulting In clean cuts, less chance for chip re-welding, a superior surface finish and a longer tool life. Right hand helix right hand cut, #51772, direction down-cut, (D) diameter 1/8, (b) Cutting height 1/4, (D) shank 1/4, overall length (L) 2, flutes 1, 51772 Solid Carbide CNC spiral 'o' Flute, aluminum Cutting 1/8 dia x 1/4 x 1/4 shank down-cut