Milwaukee ^MD Step Drill Bits with JAM-FREE performance feature a dual-flute design to drill 2X faster, last up to 4X longer, and produce up to 50% more holes on a charge than competitors. Ideal for drilling small or large diameter holes in steel or plastic, these bits are optimized for high-speed cordless drills. The Rapid Strike ^™ tip ensures a fast, accurate start that produces little heat, resulting in longer tip life. The black oxide coating also improves durability, hole quality, and bit life. For convenience and accuracy, each bit has laser-etched reference marks that are visible while drilling. The 3-Flat Secure-Grip ^™ shank Provides a secure grip in the chuck. The #3 step drill bit offers 9 hole sizes in 1/16 in. increments ranging from 1/4 in. to 3/4 in. High-speed JAM-FREE performance with most 18-volt cordless drills with lithium-ion battery technology.