Designed for professional tool users. Engineered specifically for use with impact tools, using the most up to date industrial specifications. Made from high quality alloy steel (chrome-molybdenum). Thorough and exact heat treatment ensures the correct balance of stength and duability. Tested to the highest specifications to deliver outstanding performance at the most competitive cost. Increased Strengh - Transfers the pressure from the thinnest part of the socket wall toward the thicker section, resulting in increased strength. Increased Torque - Allows up to 20% more torque to be applied than on standard impact sockets. Easier Access to Tight Areas - The shift in pressure allows us to reduce the socket wall thickness, increasing access to tight areas. Reduces Wear - Our impact sockets grip the fastener across a broader contact area, reducing the chance of rounding off fasteners. 12 Piece Set Includes: 1/4" Drive Standard Length Universal Joint Sockets: 5,5.5,6,7,8,9,10,11,12,13,14,15. Plastic Storage Tray.