Rancilio Grinder Burr & Screw Replacement Set for Rocky & MD40 Espresso Grinders - Genuine OEM Racilio Parts Genuine Rancilio replacement parts for Rancilio Rocky (doser & doserless) & MD 40 grinders Rancilio OEM Part Number: 69000032 (grinder burrs) & 37030407 (grinder M4X7 screws) Burr Diameter: 50mm x 31mm / Rotation: Left / Mounting Holes: 3 2 Replacement burrs & 6 Replacement screws genuine Rancilio OEM parts PLEASE NOTE: It is common for new burrs to have spots of oxidization from exposure to air and from the manufacturing process. This is normal, and does not mean that the burrs are used or inferior in quality.