BOSCH 2608587159 EXPERT FOR CERAMIC TILES & GLASS BIT 5mm x 70 mm Features These are expert tile drill bits from Bosch ideal for all soft to medium density tiles Diamondground tungsten carbide cutter for a precise drilling start which prevents the drill bit from slipping or going off the mark NO COOLING REQUIRED this handy new features ensures clean working as no cooling is needed for these drill bits &bull Tile drill bits Expert for Ceramic &bull Ideal tile bit for all soft to medium density tiles &bull Diamondground tungsten carbide cutter for a precise drilling start prevents the drill bit from wandering &bull NEW cooling no longer required enables clean working &bull Note Use with low speeds & without impact