Diamond Grinding Wheel for grinding stone and concrete tiles. Caution 1.before using,please read the operation manual of the tool and follow the instructions to operate correctly. 2.to protect your eyes,please wear protective glasses and use tools with safety covers. 3.please confirm whether the maximum operating speed shown on the diamond grinding wheel is higher than the no-load operation number marked on the tool used. 4.before use,confirm whether there are any exceptions. 5.please use the flange suitablefor the inner diameter and confirm the installation. 6.when polishing materials,please do not apply lateral pressure and curve polish.the polishing should be smooth,and the effect is better if water is added.