this video shows how to make perfect circles in lapidary rocks. I use a drill and some drill bits I ordered that are circle that range in size from 1/8 inch up to 1.5 inch. they are diamond coated and work like a charm. I would recommend only using them on softer stones like calcite, travertine, variscite etc. works great end of video got interrupted but really shared the gist of the conversation. what would you make with these circle hole cutters?