CR-MO alloy steel for long lifeHeavy duty blow molded storage case5.5mm Deep Impact Socket – 8055MD6mm Deep Impact Socket – 806MD7mm Deep Impact Socket – 807MD8mm Deep Impact Socket – 808MD9mm Deep Impact Socket – 809MD10mm Deep Impact Socket – 810MD11mm Deep Impact Socket – 811MD12mm Deep Impact Socket – 812MD13mm Deep Impact Socket – 813MD