ITEM NAME:4" Diamond Grinding Wheel 100mm Concrete Cup Disc Concrete Masonry Stone Tool 100% brand new and high quality Material: HSS Color: Red This Diamond Wheel generally applicable to the grinding of marble, granite, ceramic, artificial stone and glass, etc. especially suitable for the building decorated with concrete wall,marble floor, grinding edge of granite plate, chamfering and arc grinding. Featureï ¼Å¡ High speed of grinding , long service life. Can use for DIY grinding and polishing wood, metal and mold. Used on high-speed electric grinder and pneumatic tools. Specificationsï ¼Å¡ Size(diameter): 4 inch/100mm Inner hole diameter: 20mm/0.79 inch (without metal ring) Inner hole diameter: 16mm/0.63 inch (with metal ring) Thickness of diamond segment: 4mm/0.16 inch Quantity:1Pc Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!!.This Diamond Wheel generally applicable to the grinding of marble, granite, ceramic, artificial stone and glass, etc. especially suitable for the building decorated with concrete wall,marble floor, grinding edge of granite plate, chamfering and arc grinding.