Grinding wheel /grinding stone Abrasive:A ,WA,PA,,GC Grit NO.:46#,60#,80#,100#,120#,180#,220# wheel diameter:3.2--50mm .A is suitable ... for steel and iron..GC are suitable for aluminum,copper ... of molds,parts,chamfering,precious stones ,jade processing abrasive polishing. Grinding stone /grinding wheel