cast-iron bonded diamond wheel
Diamond Wheel
金刚石砂轮
钻石砂轮
金刚石抛光砂轮
金刚石磨轮
金刚石刀片
钻石磨轮
隔膜泵
Metal-bonded diamond wheel
vitrified bond diamond wheel
diamond pyramid hardnessDPH Diamond pyramid hardness test
Ⅱb type gem grade diamond
artificial diamond product