Features and Benefits:Forged from the finest chrome molybdenum alloy steel ? the best choice for strength and durabilityRadius corner design – to extend the life of fastenersHeavy molded storage trayFully guaranteed No doubt, Sunex tools offer one of the most complete and toughest Impact Socket lines around. This 3/8 in. drive, deep universal impact socket set is designed to tackle the toughest jobs with solid durability and keeps them pounding job after job. Sockets features a radius corner design, causing the socket to grab the sturdy wall of the fastener instead of grabbing the corners, resulting in less wear on the fastener. WARNING: This product can expose you to Nickel (Metallic) a chemical known to the State of California to cause Cancer. For more information go to www.P65Warnings.ca.gov.