Glass and Tile Carbide Tipped Drill Bit Set (4-Piece)The GT2000 Glass and Tile Bit Set features High quality carbide tip with reinforced head prevents bit cracking. Innovative geometry allows bit to drill faster. Precision tip solves bit wander and bit walking. PRECISION Features Boschs unique product design with a precision tip to help solve any bit wandering or bit walking QUALITY This glass and tile set includes a high quality carbide tip with a reinforced head to reduce stress, prevent bit cracking