Yandles offers on abrsive discs

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They do this every now and then when they get stock that isn't selling so well 🙂 last year I picked up 4 boxes of the Mirka sheets for a fraction of what they usually sell for
 
Ok so today I received my Mirka 800 grit and my 240 grit . I’ve used their sheet sandpaper but not ghe discs . I’m a little confused ( not difficult these days) the 800 I expected to be really rough and the 240 fine . It’s the other way round. Have I lost the plot or do Mirka,s grade their discs different to other makes or have mine been misprinted..
 
I always think about it as the number of grains in a square inch (probably not the case but it serves the purpose), so the more grains the smaller they need to be. so the higher number is the finer the grain.
 
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