The Matco Tools 3-pc 3/8” Spring Loaded Universal Joint Extension, No. SBUX3S, are ideal for hard-to-reach jobs located under dash, door panels, engine bays, transmissions, and more. The spring-loaded universal joint makes it easier to handle and place the socket on a fastener, while preventing the joint from becoming loose, the company says. The joint extensions are extra long to provide extended reach and are made of Cr-V alloy steel with mirror chrome finish.