1)Best to have a metal blade guard as hot concrete waste embeds itself
in plastic guards.
2) most concrete cutting discs (standard or diamond) have 22mm bore but
wood sawblades rarely have 22mm so you need an arbor that is 5/8" or
16mm for the wood blade and an adaptor ring for 22mm.
3)Standard concrete discs wear down in diameter so you can use all the
material but cheap diamonds from aldi/Lidl when they have them work OK
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