Zinc plated diamond hole saw for glass ,marble or ceramic ]1.Size:2-150mm ... shank 3.Zinc Plated Zinc plated diamond hole saw for glass ,marble or ceramic Zinc plated Diamond glass & tile ... ,ceramics, porcelain, ceramic and porcelain tile, limestone, slate, marble, granite, stone, and fiberglass hole drilling . Size is ... for lubrication.Pictures: Zinc plated diamond hole saw for glass ,marble or ceramic