Package contents: 2 pieces 4 inch diamond grinding disc large segment grinding disc with silver reducing washer, suitable for 100-120 angle grinder bag Size: The diameter of the diamond grinding disc is 100mm, the inner diameter of the diamond grinding disc hole is 22.2mm. The outer diameter of the variable diameter washer is 22mm, and the inner diameter of the variable diameter washer hole is 16mm Material: Made of high-quality high-strength and high-hardness manganese steel matrix with high-density diamond particles, the diamond grinding disc has pores to help maintain and cool the cutting pattern and reduce wear. Application: Suitable for grinding and processing of marble, granite, building masonry, concrete, artificial stone, etc. to smooth uneven surfaces and remove burrs. Installation and use: 1. When installing, pay attention to keeping the upper direction of the grinding disc consistent with the rotation direction of the tool used. 2. Please do not apply side pressure and curve cutting when cutting, and smooth when grinding. 3. The cutting effect of the grinding disc and water is better, and the service life can be prolonged. 4. If the grinding disc of the diamond grinding disc becomes dull during use, please re-blade on the red brick or soft grinding wheel., Manufacturer: EMSea