3/8" Drive 9 Piece Internal Star Impact Driver Set Grey Pneumatic sockets are designed for professional tool users.. Made of high quality alloy steel.. Engineered specifically for use with impact tools.. Benefits of the GP Impact Socket “High Torque” drive: Increased strength, easier access to tight areas, and reduced wear.. 3/8” Drive. Set contains star sizes T20 to T55.. T20 (1120T). T25 (1125T). T27 (1127T). T30 (1130T). T40 (1140T). T45 (1145T). T47 (1147T). T50 (1150T). T55 (1155T). Lifetime Warranty 1200T