No doubt, the strongest impact socket line around, Sunex Tools impact sockets tackle the toughest jobs with a chrome molybdenum alloy steel grip that won"t let go, With solid durability that keeps them driving through job after job, we"ve got sizes and styles enough to fulfill any need, Forged from the finest chrome molybdenum alloy steel-the best choice for strength and durability, Radius corner design - to extend the life of fasteners, The design drives the side of the fastener instead of the corner, 3/8-Inch drive, 12mm, 12 point Metric standard impact socket, SKU: ISN15829