The package includes: 1: 5pcs diamond grinding wheels: Size：Diameter of grinding wheel: 115mm (4.5 inch) arbor diameter : 22.23mm ( 7/8 inch) wideness of gear: 20mm(0.787 inch) 2 : 6 adapters: Size:Arbor 20mm(0.878 inch) *3 ,arbor 16mm(5/8 inch)*3 Segment turbo row segmented diamond cup wheel are designed for grinding concrete and field stone, it's an ideal concrete grinding wheel 4 1/2 inch for angle grinder Hole design: The angle grinder concrete grinding wheel features air holes designed to aid in maintaining and cooling the cutting pattern and reducing wear Application: Our diamond grinder wheel is used for dry/wet grinding all types of stone like concrete, granite, stone, marble, tile, cement , masonry, and some other construction material to smooth uneven surfaces and remove flashing.can also be used for the removal of glues and epoxies Made of durable 65mn,diamond and metal powder,high-quality brazed double row segments diamond grinding cup wheel for fast and smooth grinding use on both wet or dry surfaces a