Shop name:Chong Qing Shuo Yue Ke Ji You Xian Gong Si High Quality: Masonry drill bits made of high quality carbide, with a strengthened head, high hardness, not easy to break and bend, surface rust treatment, long service life Multi-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 removal triangle-: The triangle-design of helps the hand electric drill to the drill bit and prevent slipping and wandering, fit for hand electric drills Wide Application: Great for materials in interior fitting work, metal, glass, ceramic tiles, wood, ceramics, stone, concrete, bricks, etc. (When drilling hard material, please water for lubrication) Name:Carbide Masonry Drill Bit :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 Package Contents: 10 * Masonry Drill Bit Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.