Original (OEM) Mazzer burrs, model 251(new version of 151A), for Mazzer Major Coffee Grinder. Designed to grind for espresso Compatible with Turin DF83, The Niche Duo - Flat 83mm burrs Lasts for about 600kg/1200pound of coffee. Outside diameter 83 mm, inside diameter 49 mm, thickness 9.6 mm, rotates Right. Hardened Steel. Made in Italy. Original (OEM) Mazzer burrs, model 251(new version of 151A), for Mazzer Major Coffee Grinder. Compatible with Turin DF83. Lasts for about 600kg/1200pound of coffee. Outside diameter 83 mm, inside diameter 49 mm, thickness 9.6 mm, rotates Right. Hardened Steel. Made in Italy.