Made from high strength chrome vanadium steel, provide superior torque for greater turning power. 12 teeth spline socket, suitable for various fasteners, such as 6 points, 12 points, E-torx, Triangle, square etc. Ideal for high-torque applications such as removal of tamper-proof lug nuts, cylinder head bolts, and other engine bolts. Come with a tight and durable case with 2 metal lock! The sizes are also stamped beside each slot for identification! 1-year warranty. Please feel free to contact us if we can do anything for you!