... .straight round shank 3.Zinc Plated Zinc plated diamond hole saw for glass ,marble or ceramic Zinc plated Diamond glass & tile hole ... -150mm, Threaded, Straight and round shank, It could be used for glass, tile and stone drilling, The normal total length is ... —150mm ,it is very easy to use , just add water for lubrication.Pictures: Zinc plated diamond hole saw for glass ,marble or ceramic