... 2.straight round shank 3.Zinc Plated Zinc plated diamond hole saw for glass ,marble or ceramic Zinc plated Diamond glass & tile ... ,75mm 90mm and 95mm, Diamond Core Drill Bits, also know as Diamond Hole Saws, are used to drill glass,ceramics, porcelain, ceramic and ... —150mm ,it is very easy to use , just add water for lubrication.Pictures: Zinc plated diamond hole saw for glass ,marble or ceramic