29 Pc. Black & Gold Metal Index Drill Bit Set Oxide treatment resists corrosion, helps prevent bit from rusting. TURBOMAX tip starts up to 10x faster. 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. Rubber overmolded case protects kit if dropped. Tap & Drill selection chart for convenient reference. Automatic indexing for easy bit access and identification. Removable cartridges: easy to carry bits from case to worksite. Sizes include 1/16 to 1/2 in 1/64 increments 3018005