Mounted Abrasive Points: Shape: Serial A ; B ; W. Grain material: Alumina ; White Alimina ;Chromium Alumina; Silicon carbide YC-AS-010 Grinding Mounted StoneMounted stone with strong grinding, hard-wearing. In high qualityMounted stone can be used for metals grinding,mending,and ect. Diameter of shank:Φ2.35mm,Φ3mm,Φ6mm,1/8",1/4"Material: PA, WA, A, GC YC-AS-010 Grinding Mounted Stone