Irwin 1837472 Impact Duty Power Bit, No 1, Square Recess, 4 In Oal, High Grade S2 Tool Steel

Product Features

• Built for maximum durability and long life with impact drivers
• Forged bit (vs milled) for superior fitment, which reduces stripping and increases life of bit 3X
• Manufactured with heavy-duty, cold-forged, high-grade steel to withstand high torque output
• Black oxide finish resists corrosion and increases life of bit
• Rockwell hardness of 58 to 62