Crescent APEX Industrial 2" Square Power Drive Bit SQ2 - 5 Pack Impact rated design for use in impact drivers Durability: full body design increases durability & strength by reinforcing bit tip. Life: modified S2 steel & proprietary heat treat process maximizes bit life. Best fit: optimized tip geometry for exact fastener fitment. Helps to eliminate cam-out and promotes fastener retention. APEX takes pride in providing customers with durable, affordable and innovative tools that help to increase productivity and operating efficiencies. That’s why they conducted extensive research to identify the key features users need from their tools. APEX’s Industrial Fastening line was developed to enhance durability, extend life and improve tool fit, while also making tools easier to identify.