High Quality: Masonry drill bits made of high quality carbide, with a strengthened head, high hardness, not easy to and bend, surface rust treatment, long service lifeMulti-grind Bit Head: Multi-grind sharp edges deliver high drilling speed even in hard materials, 85% faster than standard bits, U-shape groove good chip removaltriangle-: The triangle-design of helps the hand electric drill to clamp the drill bit and prevent slipping and wandering, fit for most hand electric drillsWide Application: Great for most materials in interior fitting work, metal, glass, ceramic tiles, wood, , stone, concrete, bricks, etc. (When drilling hard material, use water for lubrication)Name:Carbide Masonry Drill Bit:10pcsColor: BlueMaterial: cemented carbide4 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 usePackage Contents:10 * Masonry Drill BitOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.