Features and Benefits: Forged from the finest chrome molybdenum alloy steel - the best choice for strength and durability Extension Size: 13" Fully guaranteedNo doubt Sunex tools offer one of the most complete and toughest Impact Socket lines around. This 1" drive impact extension is designed to tackle the toughest jobs with solid durability and keeps them pounding job after job. When working in confined areas and you need that extra reach or length this works great!