Features: brand new and high quality This tile hole saw are made of steel. Thicken corundum coating on the tops offers superior cutting strength for maximum drilling outcomes. Each hole drill bit was processed by a smooth and exact finish that lower the incision resistance and drill pressure, increase the sharpness and the use of water lubrication. Excellent for making clean and precise hole on glass or ceramic and considerably extending drill bit life. These ceramic drill bits along with large clearance hole facilitate the entrance of cooling water and escape of chips. Making the drilling process more easy and relax. Perfect for drilling glass, tile bottles, blocks jars, fiber glass, porcelain, tile ceramic, vitrified, brick and stone. When debris gets stuck in the hole saw. You can use the mini screwdriver to pull it out. Specifications: Material:Steel Color:Silver Product Type:5mm(0.2inches) / 6mm(0.24inches) / 8mm (0.31inches)/ 10mm(0.39inches) / 12mm(0.47inches) Note: Please allow 1-5mm errors due to manual measurement. Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same. Package includes: 5 Pieces Diamond Hole Saw Drill Bit/Set