Features and Benefits: Optimized for use with 3/4″ drive impact wrenches, and adapters;Standard Metric Impact Socket;Stamped and ink filled diameter markings for wear resistance;6-Point design made with forged impact steel for durability in high torque applications backed by our Lifetime Guarantee;Dual hole design and groove for easier attachment;Non-slip hex geometry to prevent socket and fastener rounding;Lifetime Guarantee covers impact sockets and extensions only;Laser etched part number;Meets ASME Industry Standards;The MILWAUKEE? SHOCKWAVE Impact Duty? 3/4″ Drive 19MM Standard 6 Point Socket features the boldest, longest-lasting markings and extreme impact durability in high torque applications. The stamped and ink-filled size marking enables an accurate socket selection every time throughout the life of the socket. Engineered with high-strength forged steel for optimized performance in heavy-duty applications, and a non-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. Compatible with optional Retaining Ring (49-66-6744).