MATERIAL: Diamond.Color: Gold. Package includes: 1* Double Row Segmented Diamond Cup WheelsSPECIFICATIONS：Inner diameter : 22 mm / 0.87 Inch,Diameter of Grinding Wheel: 115mm(4.5 inch),Thickness of Grinding Wheel Disc Body: 22mm(0.87 inch),Thickness of Gear: 9mm(0.35 inch). Please double check the size info before purchase.HOLE DESIGN: The angle grinder concrete grinding wheel features air holes designed to aid in maintaining and cooling the cutting pattern and reducing wearFAST CUTTING AND DURABLE: Diamond Cup Wheels provides for very fast cutting action on masonry, stone, and concrete. High diamond concentration for long life and aggressive material removal. This diamond cup grinding wheel featured large grinding segments with heat-treated steel bodies increases durability and wheel life.APPLICATION: Our 4.5 inch Diamond Cup Wheels is used for dry/wet grinding of concrete, granite, stone, marble, tile, masonry, and some other construction material to smooth uneven surfaces and remove flashing.