Features: Professional alloy steel drill bit set delivers exceptional sharpness and wear resistance for precise drilling in tile, glass, ceramic, and masonry without chipping edges. Features U grooves design for efficient debris removal and 45° self centering tip that maintains stability during high speed drilling, ensuring clean openings on fragile surfaces. Ideal for contractors, DIY enthusiasts, and craftsmen requiring reliable tile drill bits and multi material masonry drill bits for home renovations or professional projects. Perfect for bathroom installations, mirror hanging, or creating plumbing access points in porcelain tiles, glass panels, and wooden surfaces with standard electric drills. The comprehensive carbide drill bits set includes 6 sizes with triple flat shank design for secure chuck grip, covering common diameters from 1/8" to 1/2" for functional material penetration. Specifications: Product material: Alloy steel Type: Black 5+6+8+10+12mm two pieces each / Black 3+4+5+6+8+10+12mm 7pcs(Optional) Package Includes: 1Set Professional Tile Drill Bit Set note: Please allow 1-3cm error due to manual measurement. please sure you not mind before you bid. Due to difference between different monitors, the picture may not reflect the actual color of the item.