Features 1、Diamond drill bits are made of industrial grade carbon steel and have a nickel-plated coating to resist corrosion. The thickened diamond coating on the top provides excellent cutting strength for high-precision, smooth cuts without hemming for maximum drilling results. 2、5mm/0.2inch, 6mm/ 0.23inch, 8mm/0.31inch, 10mm/ 0.39inch, 12mm/0.47inch, 14mm/0.55inch, 16mm/ 0.62inch, 18mm/0.7inch, 20mm/0.78inch, 22mm/0.86inch, 25mm/0.98inch, 26mm/1.02inch, 28mm/1.1inch, 30mm/1.18inch, 35mm/ 1.38inch，40mm/ 1.57inch, 45mm/1.77inch, 50 mm/2inch，to meet various demands. 3、Diamond hole saw drill bit set kit removes a complete circle from glass, marble, tiles,granite, ceramic or other. , Perfect for drilling glass, porcelain tile, granite, bottles, Wood, Blocks Jars, ceramic marble and other hard surfaces etc. 4、When the diamond bit is working, please continue to add water to reduce the drilling speed, reduce the drilling pressure, and increase the water lubricity, which will greatly extend the life of the bit. Specification Features: 【High Quality Drill】Diamond drill bits are made of industrial grade carbon steel and have a nickel-plated coating to resist corrosion. The thickened diamond coating on the top provides excellent cutting strength for high-precision, smooth cuts without hemming for maximum drilling results. 【Tile Hole Saw 18 Sizes】5mm/0.2inch, 6mm/ 0.24inch, 8mm/0.31inch, 10mm/ 0.39inch, 12mm/0.47inch, 14mm/0.55inch, 16mm/ 0.63inch, 18mm/0.71inch, 20mm/0.79inch, 22mm/0.87inch, 25mm/0.98inch, 26mm/1.02inch, 28mm/1.1inch, 30mm/1.18inch, 35mm/ 1.38inch，40mm/ 1.57inch, 45mm/1.77inch, 50 mm/2inch，to meet various demands. 【Wide Usage】Diamond hole saw drill bit set kit removes a complete circle from glass, marble, tiles,granite, ceramic or other. , Perfect for drilling glass, porcelain tile, granite, bottles, Wood, Blocks Jars, ceramic marble and other hard surfaces etc. 【Warm Prompt】When the diamond bit is working, please continue to add water to reduce the drilling speed, reduce the drilling pressure, and increase the water lubricity, which will greatly extend the life of the bit. Being hollow, allows the water to up inside and around the inner of these drill bits as you are drilling, helping to keep the drill bit cool and removing the debris. Start your hole diagonally, make a round trace and then hold drill straight. Specifications: Material : Carbon Steel Chuck Type: Round Chuck Diameter: Above 8mm/0.31in Compatible Material: Glass, Porcelain tile, Granite, Bottles, Wood, Blocks Jars, Ceramic marble etc. Package Size：16*13*7cm/ 6.3*5.1*2.in Package Weight:460g /16.22oz Package List: 18*Tile Hole Saw Package List 18*Tile Hole Saw