... /s Certificate:EN, PMA Grinding wheel for stoneMaterial:Aluminium OxideCertificate:EN, MPA Application Chart for Grinding Wheels(Recommendations)Abrasive GrainsBond HardnessApplications MaterialAR,QNormal Steel ... /Mild SteelP,QStainless Steel(INOX)CSStone/MasonryACQ,R,S,TCast Iron and None-Ferro Metal ...