【Premium CR-V Steel】Made from heat treated chrome vanadium steel (50BV30), with corrosion-resistant black phosphate finish.【Set Includes】15 Pieces 1/2″ Dr. shallow metric sockets: 10, 11, 12, 13, 14, 15, 17, 18, 19, 21, 22, 24, 27, 30, 32mm; 2 Pieces 1/2″ Dr. extension bars: 5», 10».【High-torque】Radius corner, 6-point design turns the flat sides of the fastener and provides maximum torque, while preventing the corners from damaging.【Laser Marking 】High-contrast size marking is permanently laser etched for easy identification even in low light.【Service Guarantee】All MIXPOWER Tools meet or exceed ANSI performance standards. It comes with 1 year quality guarantee.