Impact Sockets Developed For Your Power Tools. Specially designed to resist the stresses from impact, or " Dynapact" tools. Their special steel & heat treatment ensure very high yield strength & wear resistance. All sockets & accessories feature a groove & side-hole to UNI ISO 2725. Locking is ensured by a through-pin & retaining ring (to be ordered separately). Never fit chrome-finished manual sockets Impact tools.