TEMO Tamper Proof IPR-55 3 inch (76mm) Long Black Impact Torx Plus 5 point Socket Bit 1/2 inch (12.7mm) Square Drive Auto Repair Tool GC Impact Torx Plus 5 point Socket Bit IPR-55 The socket bits tamper proof with center hole. All are 3-1/8" (80mm) long. 1/2" (12.7mm) Sqaure Drive with drive release holes. Drop forged black chrome moly steel (CR-MO). Industrial grade quality. Suitable for air tools and electric tools.