【High Quality Materials】The diamond hole saw is made of high carbon steel with clean and soomth opening, no broken edges. Small incision resistance, stable drilling and won't break the border. 【Good Design】Center pilot holes and side holes help to easily dispose of waste; Diamond drill bit has golden paints to prevent rusting, improve surface corrosion resistance. 【Wide Application】Diamond drill bits can be used to drill ceramic tile, marble, glass, granite, concrete and other hard materials. Will work with all electric drills and hammer drills. It is your ideal choice for DIY projects and home maintenance and repair. 【Please Note】When cutting hard materials, it is important to ensure that the bit stays cool to prevent damage to the material to be drilled and premature wear of the bit. Water is needed for lubrication when drilling, which can extend the life of the bit. 【Buy with Confidence】We offer a "TWO YEAR" warranty on the hole saw. If you have any questions, do not hesitate to