- The Cerec Inlab Sirona Milling Instruments Are The Machine Parts, Known As Burs, That Do The Actual Milling Of The Composite Blocks In Their Respective Unit. Cad/Cam Milling Diamond. For zirconia & Feldesphate Descriptions: - Bur Type: Cylinder Pointed Bur. - In lab Compact Cad/Cam Milling Diamond For Mcxl. - Full Compatible Sinter Diamond Burs For Cerec Inlab. - 100% Warranted - If For Any Reason They Dont Fit On Your Machine. - Size: # 12s. - Package: 1 Per Pack. **For further product information, please contact Chat Support**