... Plated 4.Diamond tip Zinc Plated Diamond coated hole saw Zinc plated Diamond glass & tile hole cutter Diameter from 2mm-150mm, Threaded ... Straight and round shank, It could be used for glass, tile and stone drilling, The normal total length is 70mm,75mm ... , are used to drill glass,ceramics, porcelain, ceramic and porcelain tile, limestone, slate, marble, granite, stone, and fiberglass hole drilling . ...