Frankfurt Abrasive Block Frankfurt abrasive are widely used for rough,fine polishing on marble,travertine,limestone in single head machine or auto polishing machine. Description Grit Resin 320#/400#//600#/800#/1000#/1200#/1500# Compounded 320#/400#//600#/800#/1000#/1200#/1500# 5Extra/10Extra 0#