【High-quality materials】The diamond hole saw is made of high-carbon steel with a clean and smooth opening, without broken edges. Small incision resistance, stable drilling and will not break the border. 【Good design】The center pilot holes and side holes help to easily remove waste; The diamond drill bit has gold-plated paints to prevent rusting, improves the surface corrosion resistance. 【Wide application】The diamond drill bits can be used for drilling ceramic tiles, marble, glass, granite, concrete and other hard materials. Will work with all electric drills and impact 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 cutter remains cool to avoid damage to the material being drilled and premature wear of the cutter. Water is necessary for lubrication during drilling, which can extend the life of the drill bit. 【Buy with Confidence】 We offer a "TWO YEAR" warranty on the hole