Useful drilling tools for easy and fast drilling hole of , tiles, granite, ceramic and marble. Made of high quality diamond, very durable to drill holes. Features: High quality hole saw kit for drilling round holes easily and quickly. Sharp and durable teeth of hole saws ensure a powerful and high efficient results. Hole saws in various size(14 kinds 3-70mm) to meet different needs. Suitable for standard electric drill, ordinary electric drill, cordless drill, bench drill, etc. Can be widely used for drilling , tiles, granite, ceramic and marble. Great for making clean and accurate hole on and tile for home, hobby, craft, construction, etc. Specifications: Color: Silver Material: Diamond Surface Treatment: Zinc Plating Quantity: 14 pcs Hole Saw Type: 3mm, 5mm, 6mm, 8mm, 10mm, 12mm, 16mm, 18mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm Total Height: 50mm, 51mm, 51mm, 51mm, 51mm, 51mm, 53mm, 53mm, 58mm, 53mm, 52mm, 50mm, 50mm, 53mm Type: Core Drill Bits DIY Supplies: Drilling Hole for , Ceramics, Tiles, Marble Package Size: 12 * 8 * 7cm / 4.72 * 3.15 * 2.76in Package Weight: 436g / 1.0lb Note:Please always use water for lubrication, otherwise the diamond core drill will burn out. Package List: 14 * Diamond Coated Hole Saw