Special Hi-Molybdenum tool steel. 135° split point for fast penetration and accurate starting without a center punch. The precision ground point, flutes, body, clearance and drill diameter for the ultimate in accuracy and performance.
Drills are heat-treated at 2185° F and then nitro-carburize finished at 950° F to be measurably harder than high-speed steel. Set includes Letter Sizes A thru Z. Organized in an Indexed Metal Case.