Material: HHS Production process: sintering Color: Gold Applications: Suitable for grind on marble,tile, concrete,rock, etc.. Diameter:100mm/4 inch Inner hole diameter: 20mm/0.79 inch (without metal ring) Inner hole diameter: 16mm/0.63 inch (with metal ring) Thickness: 5mm/ 0.2 inch Features: - 100mm/4 inch Golden Segment Grinding Wheel. - High grinding speed, long service life - 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. - Can use for DIY grinding and polishing wood, metal and mold. - Used on high-speed electric grinder and pneumatic tools. Packaged included: 1 x Segment Grinding Wheel