Black Oxide Metal Index Drill Bit Set

15 piece, BLACK oxide, drill bit set, oxide treatment resists corrosion, helps prevent 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, case with rubberized grip & sliding latch, set includes: (2) 1/16", (2) 3/32", (1) 7/64", (2) 1/8", (1) 9/64", (1) 5/32", (1) 3/16", (1) 7/32", (1) 1/4", (1) 5/16" & (1) 3/8" drill bits.