Features and Benefits: Forged from the highest quality chrome molybdenum alloy steel for long life Packaged in compact blow molded case for durable, convenient storage and transport Fully guaranteed Set includes: SAE ? 3/16″, 7/32″, 1/4″, 5/16″ (8mm), 3/8″, 7/16″ and 1/2″; Metric – 4mm, 5mm, 6mm, 7mm, 10mm and 12mm. 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.