Features and Benefits: 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; Lifetime warranty; deep length socket features high torque drive, which limits the amount of wear on the corners of the fastener and the socket; 3/8 in. Drive x 15/16 in. Deep.