Stainless Steel Exhaust Hangers! —�—�—�—�—�—�—�—�—�- Aside from nuts and bolts, we pretty much make everything in-house. These are 304 Stainless Steel exhaust hangers that we cut out and engrave on our massive Trumpf industrial laser. Next is a trip through the rock tumbler for smoothing and finishing. Then our shipping department installs the grommets and readies them for shipping to our dealers across the country. This particular order is headed out to @summitracing (Part number UH2.5W on their site, and they are designed to fit an exhaust tube with a diameter of 2.5-inches. laser