The Milwaukee SHOCKWAVE Impact Duty Socket Set features the boldest, longest lasting markings and extreme impact durability in high torque applications. The stamped and ink filled size marking enables users to select the right socket every time throughout the life of the socket. Engineered with high strength forged steel for optimized performance in heavy-duty applications. The non-slip hex geometry prevents fastener rounding. The dual hole design and ring groove allows for easy socket attachment and removal. This set is optimized to get every job done. The cases are impact resistant and nest together for easy stacking and storage. All Milwaukee SHOCKWAVE Impact Duty Sockets and Extensions are backed by Milwaukee Tool's Lifetime Guarantee and meet ASME industry standards.