These altitudinous superior durable long-lasting Diamond Drill Bits are for use by D-I-Yers, contractors and hobbyists on very rocky or delicate materials such as as porcelain tile, instrumentality tile, stone, ceramics and glass. Bastex Diamond Drill Bits are insurance premium specialty drill designed for drilling in rocky rough non-ferrous materials. The electroplate bonded diamond drill bits a prime design developed through far-reaching testing. Water or oil is for lubrication while drilling cod to modifier heat which can damage material and bits without chilling lubrication. for drilling to depths of about 1/2 ''. -LRB- for use on metals, objective, masonry, or with impact hammer drills -RRB-. Bastex Diamond bits are designed to be an cut-price solution to cleanly and quickly drill in rocky and delicate materials where no carbide drill bit is able.Be advised damage may occur to bit or material if a lubricating chilling agent is not used. Package : 3 Diamond Hole Saw Bits 6 mm '', 8 mm '', 10 mm '' .