Some of these might seem amazing but there are standard tools and holders that can do these operations. First off there are standard roller burnishing tools for good finishes for lathes. Second why would you take a perfect good TPG insert and braze it to a holder and lose 2 good corners when there are stock tool holders for this. As for the round button cutter there are inch and metric round inserts for that as well! These are not very smart shop ideas and costly. Your hourly wage $ the cost of steel, and time to make them to me is not justified.