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A: Yes, it will cut countertops but very slowly. You have to let the bit cool down after a few seconds. & it depends also how thick the countertop you are cutting. I due pattern cuts, so regular carbide saws won't work. This bit is very exacting.
A: I used this for removing grout between tiles as well as trimming stone tile. I would not recommend for larger areas but it worked well for the 6 or 8 pieces of 1/2in wide and 3/8in inch thick stone tile I needed to trim.
A: Didn't try it for that job. But cuts very well.
A: Won’t work if it is a marble counter top.
A: Granite and marble countertops, 3 cm thick? No, it won't. If you need to do a sink cutout in a stone slabs, you need specialized tools.