where items are from often help solve the question.for example industrial kitchen anything is most likely stainless steel or anything that comes into contact with food will generally be ss. most of my s.s. comes from industrial applications where rust is not welcome, kitchen sinks, and mufflers, Where industrial ss is more likley to be non magnetic, household items usually have the magnetic s.s. i have yet to see a non magnetic s.s. muffler but i keep looking



when in doubt hit it with the grinder