Fiorenzato F4 64 mm Lower Burr Carrier Lower burr carrier for the Fiorenzato F4 grinder, sized for the 64 mm flat burr set (FI_214, sold separately). SPECIFICATIONS Outside diameter: 64 mm (for flat burr) COMPATIBILITY Fits: Fiorenzato F4A, F4A V220-110, F4E INSTALLATION Moderate difficulty, burr carrier replacement involves removing the burr and hopper assembly; a qualified technician is recommended if you haven't done a burr swap before. PRO TIPS Replace burrs and check the carrier for wear or play at the same time, see Espresso Parts' grinder burr maintenance guide for when to replace burrs and how to do it.