
My issue isn't with the performance of the product, it's with the fact the product doesn't match the description provided on the website.I purchased this wheel because I needed to grind a 4.1" counterbore into a concrete counter-top surface 2.3 mm deep for a flush-mount trim kit. The description indicates this is a 4" wheel, the technical specification indicates 4.2" however when I measured the cup wheel, the actual measurement is 3.955" (measured using digital calipers). The description and technical specifications do not match the product.That said, with the jig I created, I was able to move the grinder around a little and get the exact dimensions I needed and the grinding cup wheel worked as expected; I've used their concrete wet polishing pads and have had good results as well.

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