Original (OEM) Conical Mazzer burrs, model 191C, for single phase Mazzer Kony. These Burrs should last approximately 1600 pounds of coffee. Diameter external: 63 mm Diameter internal: 12 mm Thickness: 23 mm. with La Marzocco Vulcano Coffee Grinders, Niche Zero Grinder. Made in Italy. Original (OEM) Conical Mazzer burrs, model 191C with Mazzer Kony, La Marzocco Vulcano, Niche Zero Coffee Grinders. These Burrs should last approximately 1600 pounds of coffee. Diameter external: 63 mm Diameter internal: 12 mm Thickness: 23 mm. Made in Italy