Includes: (13) 6-Lobe Standard Star Bit Sockets: T8 1/4 Drive (ATD-126) T10 1/4 Drive (ATD-127) T15 1/4 Drive (ATD-128) T20 1/4 Drive (ATD-129) T25 1/4 Drive (ATD-130) T27 1/4 Drive (ATD-131) T30 1/4 Drive (ATD-132) T40 3/8 Drive (ATD-124563) T45 3/8 Drive (ATD-124564) T47 3/8 Drive (ATD-135) T50 3/8 Drive (ATD-124565) T55 3/8 Drive (ATD-124566) T60 1/2 Drive (ATD-138) Includes 6-lobe standard 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