... hand-operated machine or floor repolishing machine grit 50,200,400 size 4" 6" 8" 10" grinding tools pressed granulated resin diamonduse for hand-operated machine ... or floor repolishing machine grit 50,200,400size 4" 6" 8 ... granulated resin diamond use for hand-operated machine or floor repolishing machine grit:50#,200#,400#