Features: Made form high quality chromium-vanadium steel, this universal joint socket has high hardness and durability. Universal joint is flexible joint that allow you to use a socket with a ratchet, breaker bar, or extension. When a nut or is accessible, but there is limited clearance around it, a universal joint would be a good helper. There are universal joint sockets in different sizes that you can choose. Flexible joint is great additions to any tool box and can help reduce time and frustration when working on your car. Specification: Material: Chromium-vanadium steel Color: Silver Size: 1/4", 3/8", 1/2" (Optional) Weight: 22g~140g / 0.8oz~4.9oz (approx.) Package list: 1 * Universal Joint Socket Made form high quality chromium-vanadium steel, this universal joint socket has high hardness and durability. Universal joint is flexible joint that allow you to use a socket with a ratchet, breaker bar, or extension. When a nut or is accessible, but there is limited clearance around it, a universal joint would be a good helper. There are universal joint sockets in different sizes that you can choose. Flexible joint is great additions to any tool box and can help reduce time and frustration when working on your car.