This 35 piece set is made in the U.S.A and is our most complete TORX® bit socket set. Bit sockets feature SK's high polish SuperKrome® finish, which provides for long life and maximum corrosion resistance. Through-hole design makes it easier to replace worn or broken bits: simply pop the old bit out and insert a new replacement bit. The new bit holder design is 9 times stronger and helps prevent the bit from slipping out of the socket while working. Bits are manufactured to rigid standards using high strength S2 steel. This set also features Tamper-Proof TORX® bit sockets, designed for use on tamper-resistant hex fasteners found in a variety of industrial and institutional settings, and Female TORX® sockets, manufactured to rigid standards. With the help of an extension or universal joint, sockets can be used in awkward spaces.High Strength, S2 steel bitsMade in the USA1/4" Drive Bit Sockets - T8, T10, T15, T20, T25, T27, T30 TORX; 3/8" Drive TORX® Bit Sockets - T40, T45, T47, T50, T55; 1/2" Drive TORX® Bit Socket - T60; 1/4" Drive Tamper-Proof TORX® Bit Sockets - T7, T8, T10, T15, T20, T25, T27, T30; 3/8" Drive Tamper-Proof TORX® Bit Sockets - T40, T45, T50, T55; 1/4" Drive Female TORX® Sockets - E4, E5, E6, E7, E8; 3/8" Drive Female TORX® Sockets - E10, E12, E14, E16; 1/2" Drive Female TORX® Socket - E18