Specification:Item Type: Grinding Cup WheelHole Diameter: Approx. 16mm / 0.63inDiameter: Approx. 100mm / 3.94inThickness: Approx. 1.2mm / 0.05inMaterial: CarborundumHardness: 60Application: Suitable for metal, stainless steel, steel, copper, wood, plastic and other materials decoration line processing, polishing, deburring, etc.How to Use:Takeouttheproductandusedirectly.Package List:5 x Grinding Cup WheelNote:Please pay attention to safety.