We had the flanges precision machined from 304 SS to our exact tolerances for a precise fit over exhaust tubing. 3" & up clamps have heavy-duty Stainless-Steel 8mm bolt with larger nut for increased durability in extreme conditions...you won't find that anywhere else!!! 2.5" and below have a Stainless-Steel 6mm bolt. Nuts are non SS to prevent thread galling.
We can custom laser engrave these claps along with many of our other products!