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Product Description Impact sockets are forged from high-quality chrome molybdenum alloy steel for durability and superior strength. Patented sidewall drive sockets apply force to the walls of the fastener instead of the points, resulting in longer fastener life. Laser-etched, hi-visibility markings allow for easy readability. Meets or exceeds ANSI and government torque performance specifications. Set features 40 Metric-Pieces in standard and deep length. From the Manufacturer This Sunex 1/2 inch drive master 39 piece metric impact socket set includes the most common sizes used for automotive repair. It includes 39 metric sockets. It is made of CR-MO alloy steel for long life. It is fully guaranteed and includes a heavy duty blow molded storage case.