General description Heavy Duty 3PC Extra Long 1/2 Drive Metric Socket Extension Bar set is designed for durability and efficiency. Made from chrome vanadium steel, these extension bars are built to withstand heavy use and provide reliable performance. Technical specifications Material: Chrome vanadium steel Lengths: 150mm (6 inches), 250mm (10 inches), 450mm (18 inches) Drive size: 1/2 inch Spring-ball socket retainers for secure fit Other information 3 Year Warranty Included