They are for use in general machine tapping or CNC tapping.. Black oxide high-speed steel dill bits are ideal for production, maintenance or portable drilling jobs and are surface treated with abrasion-resistant black oxide. Set contains one High Speed Steel Hand Plug Tap and the matching size.
Split point jobber drills are manufactured to National Aerospace Standard 907, these drills are ideal for portable or machine drilling of low tensile strength alloy materials..