The Platinum Tech 3-pc Spring Loaded Universal Joint Set, No. PLT-99303, is ideal for work in close quarters such as under dash, engine bays, and more. Its spring design prevents the joint from becoming loose. The set includes 1/4" Drive Spring Loaded U-Joint, No. PLT-99304; 3/8" Drive Spring Loaded U-Joint, No. PLT-99305; and 1/2" Drive Spring Loaded U-Joint, No. PLT-99306.