Bosch Natural Stone Tile 3-3/4-in High-Speed Steel Masonry Drill Bit for Hammer DrillMultigrind head designed with multiple cutting edges for harder tile materials Fast drilling in hard materials delivers 20 percent faster drilling than glass and tile bit Specialized carbide tip centers for no skate drilling and greater ease of use High quality carbide material provides longer life in hard materials Three flat shank offers outstanding bit grip to avoid slippage Engineered for use in natural stone tile, slate, granite and other