The MILWAUKEE 3-Piece SHOCKWAVE Impact Duty 3/8" Drive Deep Well Socket Set features the boldest, longest-lasting markings and extreme impact durability in high torque applications. The stamped and ink-filled size markings make it easy 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, and a Nn-slip hex geometry prevents fastener rounding. The dual-hole design and ring groove allow for easy socket attachment and removal. All SHOCKWAVE Impact Duty Sockets are backed by a Lifetime Guarantee and meet ASME industry standards.