Brown Recluse Spider Bite: Identification with Pictures Montana MB 65230 Diamond Tile Drill Bit Set. 10X Faster drilling than standard glass and tile drill bits 15X Longer life versus carbide tip spade drill bits Drills up to 40 holes* Diamond sintered cutting edge drills clean, round holes Segmented cutting edge design for improved irrigation and material evacuation Black oxide finish prevents corrosion and increases performance Heavy duty single piece construction Large core ejection slot for easy material and plug removal Works with all cordless drill drivers