Drill bits black oxide. Black oxide drill bits are manufactured form industrial high speed steel, surfaced treated for high performance and long life. Designed to drill common steel (flat bar, single iron, tubing), wood and plastic. No center punch needed: Century quick-cut points are self centering and penetrate faster with less pressure, will not walk or wander at the starting surface. Manufactured to aerospace NAS 907-B specifications. Product Features:Designed for drilling soft metal mild steel wood plastic and PVC Manufactured from industrial high speed steel surface treated for high performance and long lifeBlack Oxide drill bits offer 6 times Life Rating when compared to standard 118 Degree point drill bitsCentury 135 degree quick cut points are self-centering and penetrate faster with less pressureMade in the USA
