国产自产在线视频一区|日韩理论中文字幕|手机国产在线不卡|中国性爱电影AV在线|久久久无码国精品无码三区三|中国黄片在线免费观看|国产人在线成免费视频|国产一区二区毛片

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.