General description Neilsen Universal Swivel Impact Bit Driver Socket Set is designed for versatility and durability. This 7-piece set features drop forged, heat treated, chrome molybdenum steel construction with a durable phosphate finish, ensuring long-lasting performance. Technical specifications Drive size: 1/2 inch Socket sizes: 13 mm, 14 mm, 15 mm, 17 mm, 18 mm, 19 mm, 21 mm Design: 6 point swivel metric Usage The radius corner design contacts only the flat surfaces of the fastener head, which helps to eliminate rounding off corners and extends the life of fasteners. The ball/swivel action allows the sockets to be useful in tight corners, making it easier to work in confined spaces.