12 PC 3/8″ DR 6 PT STANDARD LENGTH FRAC UNIV SETFeatures and Benefits:Made of high quality steel (chrome-molybdenum)Engineered specifically for use with impact tools, using the most up to date industrial specificationsMade to transfer the pressure from the thinnest part of the socket wall toward the thicker section, resulting in increased strengthPackaged in a molded storage caseLifetime WarrantyContains Sizes: 5/16″, 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″, 13/16″, 7/8″, 15/16″, 1″ in standard length. Packaged in a molded storage case.