【High-Quality Material】These universal joints are made of Cr-V steel and feature a durable, corrosion-resistant black oxide surface. The device is structurally robust, ensuring a longer lifespan. 【Package Include】This set of universal joint drive end sizes are 1/4 inch, 3/8 inch, and 1/2 inch. They have undergone precise machining, conforming to and exceeding ANSI standards. They are suitable for any compatible tool. 【Precision Design】The spring-loaded locking ball secures the universal joint firmly in the groove of the socket set or extended pole, ensuring a more reliable and secure connection, minimizing the risk of detachment, and enhancing work efficiency. 【Upgrade optimization】 We have optimized the structure of the universal joint, allowing it to achieve a maximum bending angle of nearly 90 . Therefore, it is more suitable for operation in narrow spaces, efficiently solving your problems. 【Quality Assurance】Each U-Joint socket in this kit is equipped with easy-to-read size markings, allowing for quick and easy identification even in dim lighting conditions, ensuring efficient work.