carving tools for gemstone: Last 5-10 times longer than diamond plated bur For dental lab,jewelry,lapidary,gemstone 5 grits. Technology:1. ... burs can be used by dental labs, jewelry, lapidary and gemstone.2. All burs are with HP shank, 3/32”, ... combinationsMulti-purpose bur. For metals, stones, porcelain and enameling.Red Fine325meshISO 514For final shaping. Good for trimming metal margin before ...