Premium CR-V SteelMade from drop forged and heat treated chrome vanadium steel (50BV30) with black phosphate finish. Set Includes13 Pieces 3/8-Inch Drive Deep Impact Socket Set:7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 mm High-torqueRadius corner, 6-point design turns the flat sides of the fastener and provide maximum torque, while not peeling and damaging the corners. Laser Marking High-contrast size marking is permanently laser etched and easy to read, even in low light. Service GuaranteeAll MIXPOWER Tools meet or exceed ANSI performance standards. It comes with 1 year quality guarantee.