: These diamond drill are made of high 45 steel which is high and durable. With a -plated coated body to resist corrosion, which has a long service life. chip holes to when the punching , punching . Smoothly Cutting: A thicken diamond dust coating on the tops offers superior cutting strength for creates a high precision, cut with no broken edges. Reduced drill speeds, low drill pressure, and increased use of water lubrication will extend drill bit life considerably. Multiple Applications: The diamond drill bit can remove a complete 130mm diameter hole on glass, tiles, granite, ceramic. In addition to cutting holes for glass, the comes in for tile bottles, blocks jars, fiberglass, porcelain tile, ceramic, , marble, light stone. Not for use on Concrete or for depths beyond about 1/2inch. Specification: Finish: -plated Colour:Silver Material:Diamond+45 steel Size:130mm Package Contents: 1* diamond drill bit How to Use: 1. Put glass drill into the driller. 2. Because this cannot locate the , so please cutting with it slowly with 45 degrees. 3. Please cut a small first to locate the , then you can cut the material vertically. 4. The speed needs to be controlled, not too fast and water is required during cutting. Attention 1. When you using the diamond drill , please use lubrication (water). Otherwise, the diamond core drill will burn. 2. Please do not cut metal material with this tool. 3. Not for use on Concrete or for depths beyond about 1/2inch. 4. Please keep the speed within 800-1000 per , low drill pressure, and increased use of water lubrication will extend drill bit life. Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.