... diamond core bits for glasse 1. Glass Core Drill Bits 2. hard ceramic drill,for drilling Glass,ceramic,tile. 3. use durable ... 2). hard ceramic drill,for drilling Glass,ceramic,tile.(3). Very long using life,no break(4).perfect package and sending goods ... diamond tools specially used for stone,concrete,asphalt,porcelain,tiles,glass and other construction materials. Our products are exported to America ...