check, heating check, formation check.2. Procuct SpecificationType of productGrinding wheelCertificationSGS En12413 MPAWheel Diameter100mmSize4inchThickness6mmColourBlackBore Diameter22mmAbrasivesWA PA SA ZABackingFiber glassBondReinforced ResinItem weight22Kg/cartonQuantity200pcs/cartonMax speed80m/sSub TypeFor iron3. Product Feather Using the strongest, highest tightness and strength fiber-net, fitted with rigorous testing requirement. More safely, more rest assured.Introduction of advanced