Product description: 

Working part diameter: 4.0mm
Working part height: 12.00mm
Color: Green
Material: diamond impregnated mixed ceramic powder
Grit: Fine 
Use: Fine finishing, precision work, smoothing, polishing trimming. 
Apply to: Zirconia, ceramic, precious metal, high strength metal, aluminum oxide. 
Shank diameter: 3/32" /2.35mm

Highlighted Features: 

Reduce,smoothing and finish zirconia with slight presure,extremely heatless and no-requiring water-cooling.