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;Optimized for use with 1/2" drive impact wrenches, drivers, ratchets, and adapters;Kit includes Deep SAE Sockets. The following sizes are included- 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4, 13/16, 7/8, 15/16, 1, 1-1/16;Impact resistant case with nestability for easy stacking and storage