【High-quality materials】 The diamond hole saw is made of carbon steel with a clean and neat opening without broken edges. Low cutting resistance, stable drilling and no breaking through the limit. 【Good design】 Center guide holes and side holes facilitate waste disposal; The diamond drill bit is coated with gold paint to prevent rust and improve the corrosion resistance of the surface. 【Wide application】 Diamond drill bits can be used for drilling ceramic tiles, marble, glass, granite, concrete and other hard materials. Works with all electric drills and hammer drills. It is your ideal choice for DIY projects as well as home maintenance and repair. 【Please note】When cutting hard materials, make sure that the cutter stays cool to avoid damage to the drilled material and premature wear of the cutter. When drilling, water is needed for lubrication, which can extend the life of the drill. 【Buy with confidence】We provide "TWO YEARS" warranty for the hole saw. If you have any questions,