Ratchet Extensions And Joints Available here. When you are repairing your car, sooner or later, you are going to find a nut that is either too far to reach or at a difficult angle to work on. Before you blow a gasket, make sure you have the right ratchet extensions and joints in your toolbox. These handy little devices are designed to fit on the end of your ratchet and help you to grab those hard to reach bolts. Ratchet extensions snap on to your ratchet and give you a few extra inches of reach. Ratchet joints are similar to extensions, but they have a universal joint built into them, which allows you to work on that hard to reach bolt. Ratchet extensions and joints are both handy additions to your toolkit.