... round shank 3.Zinc Plated Zinc plated diamond hole saw for glass ,marble or ceramic Zinc plated Diamond glass & tile hole ... Straight and round shank, It could be used for glass, tile and stone drilling, The normal total length is 70mm,75mm ... to drill glass,ceramics, porcelain, ceramic and porcelain tile, limestone, slate, marble, granite, stone, and fiberglass hole drilling . Size is from 2mm—150mm , ...