Irwin Tools 1837387 Impact Performance Series Insert Square Drive Bit #2 (20 Pack) Irwin a Newell Rubbermaid Brand. Square Recess Impact Insert 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