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. Provides increased strength but also avoids rounding of rusted or damaged fasteners. Fully guaranteed. No doubt Sunex tools offer one of the most complete and toughest Impact Socket lines around. This 3/8-Inch drive 7/8-Inch standard socket is designed to tackle the toughest jobs with solid durability and keeps them pounding job after job.