About this item Glass and tile drill bits For glass, window panes, mirrors, bottles, ceramics, porcelain Precision ground CT insert, lance-shaped Drill only in clockwise rotation mode and low speed, apply very light pressure, cool with water, turpentine or petroleum Packaging: plastic bag on card Product description Size: 6mm Color: as shown Shipping quantity: 1 Note: The data are all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.