Surface treated with abrasion-resistant black oxide.C HSS Black Oxide Jobber Length Drill Bit Ideal for production, maintenance or portable drilling jobs..
. Bright finish, which provides superior chip evacuation.G HSS Polished Jobber Length Drill Bit Ideal for production, maintenance or portable drilling jobs.
.Manufactured to Aerospace Standard 907. They have a black oxide surface treatment that is abrasion resistant, reduces chip welding and improves chip flow.