These exhaust fabrication clamps are used to hold two pieces of 1-3/4" exhaust tubing together when you’re making a custom exhaust. Unity Manufacturing offers two different styles, wide band for straight sections and tapered for bend sections. Hunter was able to create his people’s champ exhaust with about 5 clamps per pipe, but your needs will vary depending on the complexity of the exhaust.
They are made in the USA out of stainless steel (and a drop of USA made antiseize on the threads to prevent galling), with USA made fasteners from Colony Machine, and are guaranteed for life.