宅男在线中文字幕_亚洲色婷婷综合久久_中文字幕第一页在线无码_亚洲奷上下激烈啪啪无码

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.