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Bordo reduced shank HSS drills are ground and then a black finish is achieved by steam tempering, a thermal process resulting in a porous tool coating. This surface aids chip flow and heat dissipation. The drill is then ground a second time to achieve a bright finish on the shank and cutting edges.SpecificationsDiameter: 9/16in (14.29mm)Shank Diameter: 1/2in (12.7mm)Flute Length: 86mmOverall Length: 152mmPoint: Notched 118Helix: 30