IRWIN Tools 314015 Black Oxide Metal Index Drill Bit Set is oxide treated that can resist corrosion, and helps prevent the bit from rusting. 135-degree split point tip starts on contact, cuts with less force, flatted shanks above 11/64″ eliminates slippage in drill chuck, reduced shank above 3/8″ allows the use of larger drill bits in a 3/8″ chuck, cased with rubberized grip & sliding latch.
