91免费观看高清无码视频,91视频免费观看高清观看完整,国产性高爱潮有声视频免费,精品视频无码一区二区三区,欧洲精品无码一区二区在线观看

Diamond segment and grinding wheel products are made of synthetic diamond and a variety of metal powders as a bonding agent. They are formed by cold pressing and hot pressing, and are not easy to fall off during use. It is assembled on various professional grinding wheel processing machines for the efficient grinding and polishing of the surface, inner hole and outer circle of grinding wheel products. It has the characteristics of good sharpness, long service life and high work efficiency.