Our biggest customers are Caterpillar and Volvo. We also make a lot of stuff for Cummins and Crown (forklifs). The tubes are anything from air tubes to exhaust, water tubes etc. A lot of the volvo stuff goes on turbo chargers. We bend anything from 3/8" .049 wall all the way up to 7" .120 wall. Most stuff is 304 stainless but not all...some is mild and aluminized coated. Most are 1D mandrel bends a few jobs smaller than 1" are mandreless. 1D meaning the tube size and the bend radius are equal. 5" tube bent on a 5" radius etc.