Review on 🪚 Metal JNBPRO Countersink Drill Bit by Reginald Hamilton

I am new to the JNBPRO brand but have ordered some of these bits for use in several projects I am making. They arrived in the blister pack pictured and I tested them before using. The markings on it are very clear and the waves of each nozzle were perfectly straight. The grinding on these is decent. Not great, not bad, but good enough. So far I've used them in 1/4" steel, aluminum rod and plate, and 3/8" stainless steel. They got the job done every time with no issues. Although they had marks, after several rubbing cycles I could not detect any wear. I expect them to hold me for a while.