... )3KW or 4KW, 850rpm or 0-1500rpm JS-400 dust free concrete grinderWe JS manufacture medium-to-high grade concrete grinder ... pads,frankfurt,PCD blades,sandpaper,etc.Features:1,A dust free concrete grinder with highest performance price ratio if only require ... ,Premium bearing6,Auto balanceStandard configurations:1,Machine body of dust free concrete grinder - 1ea2,10m electric wire - 1 ea3,Triangle plate ...