ABN Titanium Step Drill Bit &ndash; 10 Steps from 1/4"-1-3/8" Inches for Plastic, Wood, Metal &ndash; Steel, Brass, Aluminum, Copper Practical: Use the ABN Titanium Step Drill Bit  10 Steps from 1/4"-1-3/8" Inches for Plastic, Wood, Metal  Steel, Brass, Aluminum, Copper to drill round holes without wasting time by changing drill bits Versatile: Works on plastic, wood, and most metals including steel, brass, aluminum, and copper Durable: Constructed from steel with a titanium coating for strength and longevity Smooth: 2-flute design for smoother cutting; 3 flat side cutouts for a stronger, better grip on a standard drill chuck. Specifications: 3/8 (8mm) shank; Step sizes include 1/4", 3/8", 1/2", 5/8", 3/4", 7/8", 1", 1-1/8", 1-1/4", 1-3/8"