High Quality CR-V SteelMade from drop forged and heat treated chrome vanadium steel (50BV30) with black phosphate finish, providing the durability for a hard use. Set Includes3" and 6" drive impact extension bar, 3/8" impact universal joint, 3/8" to 1/2 " adapter, 1/4"-3/8"drill adapter and 3/8"Dr. deep/shallow (SAE):5/16, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, 3/4 inch, 3/8"Dr. deep/shallow (METRIC):8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,21,22mm. High-torqueRadius corner design, 6-point opening reduces wear and increases torque on fasteners by placing force on fastener walls rather than fastener corners. Laser Marking High-contrast size marking is permanently laser etched and easy to read, even in low light. Service Guarantee All MIXPOWER Tools meet or exceed ANSI performance standards. It comes with 1 year quality guarantee.