Product Description
Irwin UnitBit #4 used for step drilling larger holes used for On-Board-Air applications and for drilling the AN bung for the Turbo Drain Fitting.
Sizes Included: 3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8"
Made in USA
