Features and Benefits: Oxide treatment resists corrosion, helps prevent bit from rusting Turbomax tip starts up to 10 times faster Flatted shanks above 11/64" eliminates slippage in drill chuck Reduced shank above 3/8" allows use of larger drill bits in a 3/8" chuck Rubber overmolded case protects kit if dropped Tap and drill selection chart for convenience reference. Automatic indexing for easy bit access and identification. Removable cartridges: easy to carry bits from case to worksite.