JOES Racing Products Micro Sprint muffler clamps keep your muffler secure. They fasten on to your nerf bar and are adjustable for all angles. The clamp cradles fit a 4 in. diameter muffler, but will form easily around many sizes of mufflers. Constructed from 6061 T-6 aircraft aluminum, JOES Micro Sprint clamps are easy to install/uninstall for use on many cars.