IRWIN 29-Pack Assorted Cobalt Right Handed Twist Drill Bit Set

Constructed of M-35, 5% cobalt, high speed steel for super abrasive resistance and faster cutting than M2 in tough metals, the IRWIN Cobalt Metal Index Drill Bit Set features 135° split point tips that start on contact and cut with less force. Reduced shanks above 3/8-in allow you to use the larger drill bits in a standard 3/8-in chuck. The included case has removable cartridges to carry bits from case to work site safely.