My company import all kind of roloc discs (from China,
US is not our market but wanted to say that try to find if anybody sells red, ceramic ones. They are more expensive (x2) that brown and green but last alot longer (x6) and they are really good on stainless steel.
I use them myself and as 5" fiber disc also.
In mild steel sheet metal work you dont need more that couple to get you workday finished. Use #36 for welding and #60 and #80 to other nicer stuff.
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, Juhani
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