1/2 Inch Drive Universal Joint Socket Set Universal Socket Adapters Specification: Material: Chrome vanadium steel Hardness: 45HRC Color: Silver Size: 1/2" Quantity: Features: Socket Universal Joint set, includes 1/2". Suitable for professional use, Easy to use. Chrome plated, not easy to rust, more durable. 360 ° rotation, can be used in a variety of space. 3 sizes can be connected to a variety of sleeves.