Neiko Tools USA Titanium Step Drill Bit 1/4" to 1-3/8" in 1/8" Increments * Two-Flute Design for Faster, Smoother Cutting * 3 Flatted 3/8" Shank * Heat Treated HSS with Titanium Nitride Coating * Self-starting - no walking and no center punch required * Perfect for clean holes in thin materials like steel, stainless steel, copper, aluminum or plastic