A complete star bit socket set for all applications Includes 6-lobe standard, 6-lobe tamper-resistant, 6-lobe star plus,5-lobe tamper-resistant star plus and external star bit sockets Bits are made from S2 steel to meet or exceed torque specifications Sockets are made from heat treated chrome vanadium steel for strength & durability ATD carries a complete line of bit sockets available individually. These high quality star bit sockets are designed to be used with hand tools only. The bit socket warranty is voided if they are used with any type of impact tools.