Irwin Tools 1837478 Impact Performance Series Square Recess Power Bit #2 (5 Pack), 2" Square Recess Impact Power Bits 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