The JobSmart 3/8 in. Drive Wobble Extension Bar Set comes with 3 different sizes of extension bars to accommodate a range of jobs. The extension bars give you the extra length needed to reach fasteners, and the wobble design helps you get the best angle. They're made from durable steel for strength you can rely on, and the chrome-plated finishes help protect the extension bars from wear and tear. The included sizes are: 3 in., 6 in. and 10 in.