... 2.straight round shank 3.Zinc Plated 4.Diamond tip Stone diamond core hole saw Zinc plated Diamond glass & tile hole ... round shank, It could be used for glass, tile and stone drilling, The normal total length is 70mm,75mm 90mm and ... ,ceramics, porcelain, ceramic and porcelain tile, limestone, slate, marble, granite, stone, and fiberglass hole drilling . Size is from 2mm—150mm ,it ...