Large Deep Socket Set: 9Pcs Axle Nut Impact Socket Set: 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 38 mm. Material: 1/2″ deep spindle socket set is made of high-quality chromium vanadium steel with a black phosphate protective coating, which has high strength hardness, impact resistance, and corrosion resistance.