3/16"-1/2 Step Drill Bit Cobalt M42 Spiral Flute Lifetime Warranty Drill Hog USADrill Hog USA 3 16" to 1 2" Cobalt M42 Step Drill Bit Set Spiral Flute Includes: 3 16" to 1 2" Spiral Flute Step Bit (6 Steps) Steps: 3 16", 1 4", 5 16", 3 8", 7 16", 1 2" Specifications: Premium Cobalt M42 Steel Shank Size: 1 4" New Spiral Flute Design Cuts 27% Faster Spiral Flute Produces Clean and Straight Cuts Dual Flute Design Automatically Deburrs While you Drill 3 Flat Sides on the Shank so the Bit will Not "Spin" in the Chuck Made by Drill Hog