Milwaukee® Step Drill Bits with JAM-FREE Performance feature a dual-flute style delivering up to 2X quicker hole times, up to 4X longer life and up to fiftieth additional holes per battery charge than competitors. Ideal for drilling tiny and large-diameter holes in steel and plastic, these bits are Optimized for conductor Drills in High Speed. The speedy Strike™ tip permits for a quick and correct begin that generates less heat, leading to longer bit tip life. Black compound coating additionally enhances sturdiness, hole quality and bit life.For user convenience and accuracy, every bit has laser-engraved reference marks you’ll be able to see whereas drilling. The 3-flat Secure-Grip™ shank ensures a solid reference to the drill chuck. The #12 Step drilling bit has five hole sizes in 1/8″ increments starting from 7/8″ to 1-3/8″. Jam-Free Performance in high speed with most skilled eighteen potential unit conductor drills with lithium-ion battery technology.