3pc Universal Joint Set – The Motivx Tools Universal Joint Set includes a 1/4″ drive, 3/8″ drive and 1/2″ drive spring-loaded universal joint packed in a custom foam insert that easily fits in standard rolling toolbox drawers. Advanced Grip For More Torque – Raised ridges increase torque when hand tightening and help prevent U-Joint’s from rolling away when dropped. The raised ridges can also be used for quick identification of drive sizes. U-Joints With A Twist – The key feature of these Universal Joints are the spring loaded design, which prevents the u-joint from “flopping” to one side, enabling one-handed operation.