Irwin's Fastener Drive Insert Bits are manufactured with heavy-duty, cold-forged, high-grade steel. Fastener drive insert bit set consist of 51 pieces and comes in a convenient slide lock Blue storage case with clear lid. The set has (1) 2-1/4 inch bit holder and (50) 1 inch screw driving bits
IRWIN Impact Performance Series fastener drive bits are engineered for maximum durability and long life with impact drivers. The fastener drive bits are designed with precision tip geometry so they fit fasteners more precisely, which reduces stripping and cam-out. Manufactured with heavy-duty high-grade steel, they'll withstand extremely high torque output, and the black oxide finish resists corrosion and increases the life of the bit. The sets are housed in an: IRWIN Pro Set Case, made of durable molded ABS resin and hold up to anything the jobsite can throw at them. Bits are held securely in place until ready for use, and can easily be removed or returned to the case with a simple two-step in/out process. The cases include a full-length metal hinge pin for maximum durability and long life, and bit identification is simple with easy-to-read size markings. Plus, when not in use, cases stay securely closed with an easy-to-use sliding latch. IRWIN Pocket Cases feature a compact, portable design that makes it simple to take the bits you need to get the job done. The convenient molded ABS resin cases hold up to anything the jobsite can throw at them and include easy-to-read size markings for simple identification of the set contents. Plus, the 1-piece pocket case features an easy-to-access bit holder storage compartment right on top.