Package containing only 6 bricks Glass drill bit set - 6 drill bits, 4 different sizes, 3 x 6mm tile machine, 1 x 8mm tile machine, 1 x 10mm tile machine, 1 x 12mm tile machine. Different sizes for your different needs. The unique design ceramic tile drill bit is designed with double-threaded U-groove, smooth and flat to effectively remove debris. 3-corner handle adjustment makes the glass drill more stable on the electric drill and prevents slippage. Performance - the glass drill is made of strong alloy with low resistance to cut. The surface of the tile bit is Abrasive and anti-rust throughout the process, with high hardness. Wide range of applications - tile bits can be mounted on hand drills, punts - drill forms and power drills. Tile drill bits can be used to drill glass tiles, tiles, plastic, wood, fine metal, jade, shells etc. Please note - when you drill holes with a tile drill bit, you need to switch from slow to fast, and the electric drill bit should not be pressed with force. When drilling hard materials, please add water to cool down in case the drill bit works for a long time, the temperature is too high and the drill bit is damaged.