Features: High performances 4 flute carbide drill bits for fast, precise drilling in tiles, concrete, and cement with superior durability. Features four sizes (6/8/10/12mm) and crosses shaped tip for slip resistant operation, crafted from wear resistant alloy steel for extended tool life. Designed for DIY enthusiasts and construction professionals requiring functional, heavy duty drilling solution for home renovations or job site projects. Perfect for installing fixtures on bathroom tiles, creating openings in concrete walls, or executing precise cement drilling tasks across multiple surfaces. Optimized heat resistance and multi edge design ensure minimal friction and largest drilling efficiency in challenging materials like ceramic and masonry. Specifications: Component:High Hardness Alloy Steel 6mm Length:Approx. 9.7cm/3.81inches 8mm Length:Approx. 11.6cm/4.56inches 10mm Length:Approx. 12cm/4.72inches 12mm Length:Approx. 12.5cm/4.92inches Unified Bottom Diameter:Approx.6.35mm/0.25inches Package Includes: 4Pcs Concrete Drill Bits note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the difference between different monitors, the picture may not reflect the actual color of the item.