The Milwaukee Shockwave Impact Duty 1 in. Drive 13/16 in. 4 Point Socket features the boldest, longest-lasting markings. The stamped and ink-filled size markings enable you to select the right socket every time throughout the life of the socket. The 4-point standard sockets are engineered with high-strength forged steel for optimized performance in high-stress applications, and a non-slip hex geometry prevents fastener rounding. The dual-hole design and ring groove allow for easy socket attachment and removal.