Extend your reach with the craftsman 6 inch Extension bar, 1/4 inch drive bypass obstructions and gain direct access to fasteners, even those in hard-to-reach places, when you reach for craftsman’s 6 inch extension bar, 1/4 inch drive. The craftsman 6 inch extension bar, 1/4 inch drive is easy to use. Just attach to your 1/4 inch drive socket wrench and place the correct socket in the extension bar’s drive so you can get to work.