Versatile Sizes and Precision Drilling: Equipped with three distinct sizes (20mm, 35mm, 50mm), our Diamond Core Drill Bit Set ensures precise and efficient hole enlargement. This versatility enhances work efficiency across multiple projects, making it an essential tool for any construction or renovation job. Superior Durability and Performance: Coated with premium-grade diamonds, our Multi-Layer Tapered Reamer exhibits exceptional wear resistance and maintains sharpness over time. Designed for prolonged use, it stands up to the rigors of heavy-duty applications without losing effectiveness. Flexible Wet and Dry Drilling: Our diamond brazed reamer bit is engineered for both wet and dry drilling, offering unparalleled flexibility in usage. This feature allows for optimal performance and longevity of the bit, regardless of the drilling conditions, making it suitable for a variety of hard surfaces. User-Friendly Design for All Skill Levels: Easily attachable to most standard drills, this step drill bit requires no special tools or advanced skills. It empowers both professionals and DIY enthusiasts to achieve precise, efficient drilling in materials like metal, wood, and concrete, simplifying complex tasks. Broad Material Compatibility: Ideal for creating holes in concrete, tile, marble, granite, quartz, and microcrystalline stone, our drill bits cater to a wide range of materials. They are indispensable for home improvements, construction sites, and professional settings, ensuring top-notch performance on every surface. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Specification:M14 Colour:Gold Material:Metal Package Contents: 4 x Diamond Cone Tile Bit