The bit sockets feature bits made of high-quality and durable S2 alloy steel and chrome vanadium steel. With their rare and extreme hardness, these bit sockets are designed to last a long time and resist wear. The 12-bit socket set includes 1/4" Drive: T8, T10, T15, T20, T25, T27, T30; 3/8" Drive: T40, T45, T50, T55, T60; 1/2" Drive: T70. Each torx socket size is embossed. Our tough and durable chrome vanadium steel sockets provide superior torque and perfect for superior turning power with a mirror chrome finish for maximum corrosion resistance. This is a complete, versatile torx socket set for professionals and hobbyists working on cars, trucks, appliances, gardening equipment, machinery, and other jobs requiring star fasteners/bolts. The complete set comes in a well-constructed and sturdy plastic storage case, where you can easily locate each socket and store them after use.