... :steel wire,36#--500# Abrasive Brush are used in marble, granite, limestone slate, sandstone, travertine and so on. Through grinding the ... #,320#,500#.Steel,Steel+36#used to process the hard granite for first step.Steel,Steel+36#,36# remove loose material ... # ,60#,80#coarse grinding120# ,180# ,240# rough polishing320 #,500# fine polishing abrasive nylon brush ...