General description This Diamond Hole Saw Set includes 11 pieces of diamond core drill bits ranging from 6mm to 50mm, designed for professional use on materials such as porcelain, glass, marble, ceramic, stone, and granite. The special brazed diamond design ensures clean and precise holes, making it ideal for various DIY and home improvement projects. Technical specifications Material: Carbon Steel Set includes: 6mm, 8mm, 10mm, 12mm, 16mm, 20mm, 22mm, 25mm, 30mm, 38mm, 50mm Shank diameter for 6mm bit: 6mm Shank diameter for 8mm to 25mm bits: 8mm Shank diameter for other bits: 10mm Usage Always use water for lubrication to prevent overheating and burning of the diamond core bit. Make a semicircular mark on the material and hold the drill straight while drilling. Use reduced drilling speeds and low pressure to extend the life of the drill bits. As a rule of thumb, smaller diameter bits can be drilled at higher speeds, while harder materials require slower speeds. Other information Tips: