Description: 100mm long extension bar with 1/2" DR (0.5 inch / 12.7 mm) insertion angle. This tool allows you to extend the socket when turning the bolt nut in deep areas. Product Specifications: Drive: 1/2 inch DR (0.5 inch / 12.7 mm) Total length: 3.9 inches (100 mm) Material: Chrome molybdenum. Surface treatment: matte black Note: Please do not add 2 or more extension bars to use.