ATD Tools 13776 7-Piece Tamper-Resistant Star Bit Socket Set 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 tamper-resistant 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