Features:1.Application-this hole opener is very suitable for drilling glass, ceramic tile bottles, brick jars, glass fiber porcelain, etc.2.Super material-these drill bits are made of electroplated emery, durable, long life, high quality, good performance, clean and accurate holes.3.Smooth cutting-This hole opener can create high-precision, smooth cutting without broken edges. Reducing the drilling speed, low drilling pressure and increasing the use of water lubrication will greatly extend the life of the drill bit4.When you use a diamond drill bit, please use clean water to cool the drill bit, otherwise the life of the product will be greatly shortened.5.The product has a variety of sizes, please choose the one that suits you.Notice:Actual color may be slightly different from the image due to different monitor and light effectPlease allow 1-3mm deviation due to manual measurement Package List:1 x Hole Opener