国产自产在线最新_韩国黄色视频全部免费_国内网友露脸自拍_国产一区二区的精品

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.