When I bought my 4.5" a couple decades back, it was a serious mechanics tool. Now they're more like a common hand tool. When my switch failed, I bought a new grinder for less than the cost of a replacement switch.

With the right disk, you can cut metal or masonry, grind, flap-grind, sand, whatnot. To show how common they are now, there's a new holder that converts the grinder into a small chop saw (just came out in the Canadian Tire Store catalogue, so might not be widely available). They spin fast, so hold on tight and wear protection.

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