Features and Benefits: Durable outer sleeve and insert protects high polished wheels and lug nuts from damageChrome-molybdenum alloy steel for long lifeHeavy duty blow molded caseFully Guaranteed6 Pc. SAE: 3/4 in. (light green), 13/16 in. (purple), 7/8 in. (green), 15/16 in. (brown), 1 in. (silver) & 1-1/16 in. (black) 3 Pc. Metric: 17mm (blue), 19mm (yellow) & 21mm (red) Durable outer sleeve and insert protects high polished wheels and lug nuts from damage. CR-MO alloy steel for long life. Fully Guaranteed . Heavy duty Blow mold case. 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.