Chrome Molybdenum alloy steel for long life. Features a radius corner design, resulting in less wear on the fastener. Fully guaranteed. Included in a heavy-duty blow mold case No doubt, Sunex Tools offers one of the most complete and toughest Impact Socket lines around. This 5 piece, hex impact socket set tackles the toughest jobs with solid durability that keeps them pounding job after job. The following sizes are included: 3/4", 7/8", 1", 1-1/8" and 1-1/4".