While most screwdriver bits are simply compatible with impact drills and drivers, irwin impact performance series fastener drive bits are engineered for maximum durability and long life with impact drivers. These bits are forged* rather than milled, so they fit fasteners more precisely, which reduces stripping and increases the life of the bit itself – irwin’s impact performance series bits have three times longer life than traditional bits. Manufactured with heavy-duty, cold-forged, high-grade steel, they’ll withstand extremely high torque output. Plus, a black oxide finish resists corrosion and increases the life of the bit. Set contains: (2) impact insert bit #1 phillips x 1 inch oal, (3) impact insert bit #2 phillips x 1 inch oal, (2) impact insert bit #3 phillips x 1 inch oal, (2) impact insert bit #1 square recess x 1 inch oal, (3) impact insert bit #2 square recess x 1 inch oal, (2) impact insert bit #3 square recess x 1 inch oal, (1) impact insert bit t10 x 1 inch oal, (1) impact insert bit t15 x 1 inch oal, (1) impact insert bit t20 x 1 inch oal, (1) impact insert bit t25 x 1 inch oal, (1) impact insert bit t27 x 1 inch oal, (1) impact insert bit t30 x 1 inch oal, (1) impact insert bit t40 x 1 inch oal, (2) impact power bit #2 phillips x 2 inch oal, (1) impact power bit #2 square recess x 2 inch oal, (1) impact power bit t20 x 2 inch oal, (1) impact power bit t25 x 2 inch oal, (1) impact power bit t30 x 2 inch oal, (1) impact nutsetter lobular magnetic 1/4 inch x 3 inch oal, (1) impact nutsetter lobular magnetic 5/16 inch x 3 inch oal, (1) impact nutsetter lobular magnetic 3/8 inch x 3 inch oal, (1) compact magnetic screw guide -3-1/16 inch, (1) impact socket adapter 1/4 inch to 3/8 inch x 2 inch oal and (1) impact bit holder magnetic with c-ring x 2-1/4 inch oal. Comes in a molded plastic case to hold bits securely in place until ready for use. Case holds up to rigors of daily use.