The Milwaukee 3-Piece Cobalt Step Drill Bit Set is engineered to deliver up to 15× the life in stainless steel compared to current solutions, and up to 1,000 holes in mild steel. The Cobalt Step Drill Bits are recommended up to 14ga. The elongated dual-flute design also offers users best heat management combined with the smaller steps for smoothest drilling experience, and a Rapid Strike™ tip that allows for 2X faster starts in stainless. Made in the USA with global materials, these step bits have best-in-class performance in cordless drills used on low-speed in Stainless Steel and high speed for mild steel.