... and fine grinding and polishing grainte. There abrasives are used for make rough,medium and fine grinding and polishing on granite ... .The relevant grit are as follows:For Rough Grinding: 8#,14#,16#,24#,36#,46#,60#For Medium Polishing: 80#,100#,120#,180 ... #, 220#, 240#,280#, 320#,400#For Fine Polishing : 600#, 800 ...