Three Flat Sides on Shank Prevents "Spinning" in the Drill Chuck
(2) 7/64" Cobalt M42 Drill Bits
we always recommend drilling a pilot hole first
Shank Size: 5/16"
5 Pc Step Drill Bit Set Drill Hog® Lifetime Warranty Three Flat Sides on ShankDrill Hog 5 Pc Molybdenum Step Drill Bit Set Includes: 5 Different Step Drill Bits Sizes: *3 16" 1 2" (6 Steps) Step Sizes: 3 16", 1 4", 5 16", 3 8", 7 16", 1 2" *1 4" 3 4" (9 Steps) Step Sizes: 1 4", 5 16", 3 8", 7 16", 1 2", 9 16", 5 8", 11 16", 3 4" *1 8" 7 8" (13 Steps) Step Sizes: 1 8", 3 16", 1 4", 5 16", 3 8", 7 16", 1 2", 9 16", 5 8", 11 16", 3 4", 13 16", 7 8" *3 16" 7 8" (12 Steps) Step Sizes: 3 16", 1 4", 5 16", 3 8", 7 16", 1 2", 9 16", 5