... 5-10 times longer than diamond plated bur For dental lab,jewelry,lapidary,gemstone 5 grits. Technology:1. Consist of diamonds ... dental labs, jewelry, lapidary and gemstone.2. All burs are with HP shank, 3/32”, ISO104, shank diameter 2.35mm. Fit ... motor.3. All burs are marked with color ring for reference of grit Color ringGritDental lab usageLapidary / jewelry / gem usageBlack Super coarse70meshISO ...