GP2127MD Features: -Made of high quality steel (chrome-molybdenum).-Made to transfer the pressure from the thinnest part of the socket wall toward the thicker section, resulting in increased strength. Construction: -Engineered specifically for use with impact tools, using the most up to date industrial specifications. Dimensions: -1/2" Drive x 27mm 12 point deep metric impact socket. Warranty: -Lifetime warranty.