Best Seller | IRWIN UNIBIT 4 Unibit #4 Step Drill Bit, 12 Hole Sizes, 3/16 to 7/8 in, 1/16 in Step Drill Bit, High Speed Steel, Black Oxide, 3/16 in to 7/8 in Size Range, Straight with Three Flats, 3/8 in Shank Diameter, 2 7/8 in Overall Length, Maximum Drilling Depth 1/8 in ... more IRWIN UNIBIT 4 Unibit #4 Step Drill Bit, 12 Hole Sizes, 3/16 to 7/8 in, 1/16 in Step Drill Bit, High Speed Steel, Black Oxide, 3/16 in to 7/8 in Size Range, Straight with Three Flats, 3/8 in Shank Diameter, 2 7/8 in Overall Length, Maximum Drilling Depth 1/8 in | | $45.99 go to store |