Century's Pro-Grade, USA made Charger Drill Bits Advanced Helix Geometry starts at the 135° quick-cut point modified to be self feeding and require less force from the user. The unique flute design allows for fast chip removal ensuring the cutting point remains cool reducing wear for a longer cutting life. Black and gold finish. Industrial heavy duty web provides added stability and strength for exact holes while drilling in the hardest materials. Ideal for cutting wood soft metal mild steel and plastic. Charge drill bits use less power drill more holes with cordless or electric drills per charge. Pro Pack of 6 drill bits.