The Cobalt Step Drill Bits from Milwaukee Tool feature an elongated dual flute offering, ideal heat management, and smaller steps to provide a smooth drilling experience. The laser engraved reference marks allow users to easily stop on any size. The Rapid Strike tip quickly delivers holes in stainless steel and the 3-Flat secure-grip reduces bit slippage. Made in the U.S.A. with global materials, the bits offer ideal performance when used on low speeds and with cutting fluid for stainless steel and high speeds for mild steel. For optimal use, the bits are recommended for mild and stainless steel up to 14 gauge thickness.