1.Size of Grinding Sheets: 147mm outer diameter/ 77mm inside diameter/ 8mm thickness/ 98mm center distance. 2.Model 150 grinder sheets can be used for other Commercial Electric Feed Mill Dry Wet Grinder, please measure dimension before ; 3.2PCS Model 150 grinder sheets for 3000W Electric Mill Grinder. 4.Install Steps:1. Open the front cover of the machine, remove the grinding disc, then loosen the screws that fix the grinding sheets and take out; 2. Reinstall the grinding sheets back to the original grinding sheets position and lock the screws, not lock them first. First, observe the gap between the inner circle of the grinding sheets and the mounting step, and adjust the gap to ensure uniformity. Concentric with the motor shaft. Then tighten the screws.