... .Diamond tip Zinc Plated Diamond coated hole saw Zinc plated Diamond glass & tile hole cutter Diameter from 2mm-150mm, ... Diamond Core Drill Bits, also know as Diamond Hole Saws, are used to drill glass,ceramics, porcelain, ceramic ... limestone, slate, marble, granite, stone, and fiberglass hole drilling . Size is from 2mm—150mm ,it is ... water for lubrication.Pictures: Zinc Plated Diamond coated hole saw