Features and Benefits: Optimized for use with 1/2" drive impact wrenches, drivers, ratchets, and adapters; Stamped and ink filled diameter markings for wear resistance; Deep Metric Impact Socket; 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;