Features and Benefits:�Optimized Shockzone reduces early shank breaks�21 steps with laser engraving for clear stop on size identification�Optimized for impact drivers, drill/driver compatible�Titanium Aluminum Nitride (TiAlN) coating delivers 5X longer life than competitive impact step bits�Rapid Strike tip provides fast and accurate starts�Dual spiral flute combined with the Rapid Strike Tip delivers up to 2X faster holes than competitive impact step bitsThe Milwaukee Tool line of step drill bits far surpasses the competition. With our single cutting edge design, you will have more control and a cleaner finish. Made of high speed steel, these new step drill bits are durable and designed to drill through most metals. The black oxide finish prevents corrosion and has great capacity to work with drilling lubricants. The new speed start tip prevents bit walking and allows faster penetration. With laser etched markings you will always know your hole sizes...no guess work! Finally, the 1/4 in. hex shank allows for fast bit change in impact drivers and sure grip in chucks.