I prefer the 'knotted' wire cup brushes. I seem to be jerked around less by the brush and it doesn't start to fling wires until it's nearly worn out.
It is important to check the speed rating of the wire brush because the brush will be smaller than the other tools for that angle grinder. The correct 10,000 rpm cup-brush for my 4-1/2" grinder is only 3" in diameter.
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Lewis Meyer
Falls City Ironworks
Louisville, KY
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