Features and Benefits: Forged from the finest chrome molybdenum alloy steel ¤? the best choice for strength and durabilityComes in a heavy molded storage trayFully guaranteedSet includes: 3″, 5″, 10″, and 15″ impact extensions.Male end of extension has a steel ball retainer. CR-MO alloy steel for long life Fully guaranteed Heavy duty blow molded storage caseINCLUDES:3 in. (3503) 5 in. (3505) 10 in. (3510) 15 in. (3515). WARNING: This product can expose you to Nickel (Metallic) a chemical known to the State of California to cause Cancer. For more information go to www.P65Warnings.ca.gov.