Our 4-Piece Glass and Tile Drill Bit Set features an exact start tip for clean holes and minimal bit walking in glass and ceramic tile. Engineered with sharpened carbide, MILWAUKEE® Glass and Tile Bits provide faster tile drilling than standard glass and tile bits. We've designed these bits with a reinforced carbide head for increased durability when high-speed drilling into tile and glass. We've specifically designed these bits for drilling holes in glass and ceramic tile with drill-drivers only. We don't recommend these bits for use on porcelain tile. This drill bit set includes (1) 1/8", (1) 3/16", (1) 1/4", and (1) 5/16" glass and tile bits.