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 Packaged in a molded storage case Lifetime Warranty The impact socket set features high torque drives. This feature limits the amount of wear on the corners of the fastener and the socket. It also improves the strength of the socket transfers increased torque to the fastener and allows easier access to tight areas. Each socket is thoroughly made with the correct balance of strength and durability and is tested to the highest specifications to deliver outstanding performance at the most competitive cost. Set contains the following sizes: 7mm 8mm 9mm 10mm 11mm 12mm 13mm 14mm 15mm 16mm 17mm 18mm and 19mm in standard and deep length. Features Impact Rated: No Item: Master Socket Set Drive Size: 3/8 Number of Pieces: 26