ATD Tools 13774 X-Long Star Bit Socket Set - 7 Piece Bits are made from S2 steel to meet or exceed torque specifications Sockets are made from heat treated chrome vanadium steel for strength and durability 6-lobe standard star bit sockets with extra long 4-1/2 inch shank for easy access to tight areas The bit socket warranty is avoided if they are used with any type of impact tools