Review on 1-5/8" Dry Diamond Core Bit For Brick And Block With 5/8"-11 Pilot Bit Adapter, 9.5" Drilling Depth, 5/8"-11 Arbor by Gerald Barrett

Review for 4.5" - This worked well to drill a 4.5" hole in brick for 4" RV bath fan. I first tried my Makita variable speed polisher which did not have enough power. I then finished the cut with my Dewalt 7" grinder which was burning up. Next time i would try to use a hole hawg and a plywood guide. I did purchase the centering bit as well but even with it, it was not quite right. My best suggestion for next time would be a plywood hole guide with the self centering bit that goes to a 1/2" chuck and use a hole hawg or something powerful that has a variable speed to get the low RPM. THe website has a suggested RPM depending on the hole size. After all that, an SDS bit and a chisel doesnt seem like a terrible way to do it after all.