Milwaukee Electric Tool 48-89-9209 7/8-1-1/8Step Drill Bit has Jam Free Performance that Features Dual Flute design Provides Greater Speed and Control, Up To 2 X Faster, Optimized For Cordless Drills In High Speed, Rapid Strike Tip Creates Fast, accurate Starts and Generates Less Heat, Optimized Geometry With Black oxide coating To Cut Faster and Produce Less Heat, Laser Engraved Reference Marks Easily Stops On any Hole Size, 3 Flat Secure Grip Shanks Reduces Bit Slippage In The Chuck, 2 Steps, 3/8" Shank, Metal/Plastic applications.