Unique Design - The hss earthenware drill bit adopts the double-threaded U-Groove design, which is smooth and flat, and removes chips effectively. 3-angle handle adjustment makes the glass drill bit more stable on the electric drill, preventing slippage. Performance - The glass drill bit is made of strong alloy, the cutting resistance is small. the surface of the tile drill bit is all-grinding process and rust-proof, high hardness. Widely Application - The tile drill bit can be installed on hand drills, bench drill and electric drills. Ceramic tile drill bits can be used to drill glass brick, tiles, plastics, wood, thin metal, jade, shells etc. Please Note - When drilling with the tile drill bit, it should be drilled from slow to fast, and the electric drill bit should not be pressed hard. When drilling hard materials, please add water to cool them, in case the drill bit works for a long time, the temperature is too high and the drill bit is damaged. Value Glass Drill Bit Set - 6 drill bits, 4 different sizes, 3pcs 6mm tile drill bit, 1pcs 8mm tile drill bit, 1pcs 10mm tile drill bit, 1pcs 12mm tile drill bit. Different sizes meet your different needs. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store