General description 7pcs Tungsten Carbide Tip Drill Bits Set designed for drilling into various materials including porcelain ceramic tile, concrete, brick wall, glass, mirrors, plastic masonry, and wood. This set includes drill bits in sizes 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, and 12mm, providing versatility for different drilling tasks. Technical specifications Material: Tungsten carbide Sizes: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, 12mm Measurement allowed error: +/- 1-3cm Usage Ideal for drilling into hard materials such as concrete, brick wall, glass, porcelain floor tile, marble, and granite. For drilling into hard materials, it is recommended to use water for lubrication. Other information Features a U type slot design for efficient dust removal. Triangular handle design for stable operation. Sharp spear pointed design for easy location and smooth drilling. 3-flats shank to prevent slipping and scratching, protecting tile glaze. Note: Light shooting and different displays may cause the