1pc 5"(125mm) ,Arbor:7/8"(22.23 mm), Segment height 5mm,diamond grit#40/50 Diamond grinding wheels are mainly used for grinding and polishing Concrete,Masonry,Granite,Marble and some other construction material 5mm segment heigh turbo row segments with heat-treated steel bodies of our concrete grinding wheel increases durability Turbo Row Cup wheel produces fast material removal and a smooth finish and reduce "chatter" for improved operator comfort Low-vibration design engineered to keep the wheel planted firmly on the surface for more efficient material removal