High Quality: Masonry drill bits made of high quality carbide, with a strengthened head, high hardness, not easy to break and bend, rust treatment, long service life Multi-grind Bit Head: Multi-grind edges deliver high drilling speed even in hard materials, perform 85% faster than standard bits, U-shape groove provide good chip removal triangle-Shank: The triangle-design of shank helps the hand electric drill to clamp the drill bit and prevent slipping and wandering, fit for most hand electric drills Wide Application: Great for most materials in interior fitting work, metal, glass, ceramic tiles, wood, ceramics, stone, concrete, bricks, etc. (When drilling hard material, please use water for lubrication) Name:Carbide Masonry Drill Bit Quantity:10pcs Color: Blue Material: cemented carbide 4 Size: Masonry drill bit with 4 different sizes, 4x 6mm(1/4 inch), 2x 8mm(5/16 inch), 2x 10mm(3/8 inch), 2x 12mm(1/2 inch), various sizes for different use Package Contents: 10 * Masonry Drill Bit