Chrome vanadium alloy steelHeat treatedPackaged in a blow molded caseSet includes sizes standard length fractional sockets 3/16” to 9/16”, deep fractional sockets 1/4” to 9/16”, standard length metric sockets from 4mm to 15mm, deep metric sockets 6mm to 15mm. Includes 1/4" drive Pro Ratchet and 2" and 6" extensions. Packaged in a blow molded case.