... 4.Diamond tip Zinc plated Diamond glass hole saw for tile,marble,slate Zinc plated Diamond glass & tile hole cutter Diameter from 2mm- ... Threaded, Straight and round shank, It could be used for glass, tile and stone drilling, The normal total length is 70mm,75mm ... as Diamond Hole Saws, are used to drill glass,ceramics, porcelain, ceramic and porcelain tile, limestone, slate, marble, granite, stone, and ...