Features: 1Excellent Drilling Performance: The bit is made from an iron matrix with a smooth nickel plated surface to protect the bit from rust and durability. The thickened coating on top provides superior cutting strength for maximum drilling performance. 2Premium Materials: These tile bits are made from advanced natural materials that have been specially reinforced and solidified to make them ideal for drilling. 3Application: Suitable for drilling glass, ceramic tile, ceramic, marble, porcelain, granite, light stone and so on. It is important to note that water lubrication is required when drilling, which can help extend the service life of the drill. 4The Hole Saw is Practical: After processing, the surface is smooth and accurate. The chip chute is perfect for easily cleaning tile hole saws and removing chips. 5Instructions: Draw a circular line from the oblique direction, then hold the bit straight. When using a diamond bit, use lubricating oil or water otherwise, the diamond coring bit will burn. Item Type: Diamond Drill Bit Product Material: adamas Purpose: Glass hole opener Package Included: 10 x Drill Bit&nbsp