Not a professional but a handyman who needed to grind concrete. I can't say how long it will be, but he did a great job. I used a Bosch 4 1/2 angle grinder at 11,000 rpm. The wheel is rated at 9000 rpm and the Bosch manual doesn't recommend this type of pot wheel, but that's about all I had to work with. Walk slowly and put on all protective gear.
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