In my opinion, I think they are useless. In the first video one thing that really bothered me was the BS he was saying the grinding wheel could contaminate the steel and put chips in the tungsten. Yes this is true, it can happen, but the ODDS of something noticeable in the tungsten appear, well they are not very high. Another marketing scheme to produce more awareness and in turn i think this is how arguments start with co-workers.
Return to we want your opinion.