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