• Made of high quality steel (chrome-molybdenum) • Engineered specifically for use with impact tools, using the most up to date industrial specifications • Made to transfer the pressure from the thinnest part of the socket wall toward the thicker section, resulting in increased strength • Packaged in a molded storage case • Lifetime Warranty • Sizes:10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 21mm, 22mm, 26mm, and 27mm.