This 360 degree swivel knuckle joint is manufactured by precise-machined heat-treated black chrome molybdenum steel material, with high strength, impact resistance, and outstanding durability. 30° motion angles design, smooth and flexible operation, and with large torque force. Full 360-degree rotatable motion allows it to be used in tighter space for larger coverage. A spring-loaded ball at the end of the rod and a anti-fall bolt hole inside of the adapter can locks the socket in place to ensures safety use and can prevents falling.Specifications:Name: Impact Wrench Drive JointMaterial: Chrome Molybdenum SteelColor: BlackType: 1/4inch, 3/8inch, 1/2inch (optional)Size of interface:1/4inch: 6.3mm / 0.25in3/8inch: 10mm / 0.39in1/2inch: 12.5mm / 0.49inLength:1/4inch: 40mm / 1.57in3/8inch: 50mm / 1.97in1/2inch: 70mm / 2.76inPackage size: 74 * 14 * 14mm / 2.91 * 0.55 * 0.55inPackage weight:1/4inch: 34g / 1.20ounce3/8inch: 75g / 2.65ounce1/2inch: 171g / 6.03ouncePacking List (1/2inch, 3/8inch and 1/4inch optional):1 * Drive Joint