durability and performance: Coated with grade diamonds, our MultiLayer Tapered Reamer delivers exceptional wear resistance and longlasting sharpness. Built for prolonged use, it withstands heavyduty applications without losing effectiveness. Flexible wet and dry drilling: The diamond brazed reamer bit supports both wet and dry drilling, offering flexibility across drilling conditions. This enables reliable performance on a variety of hard surfaces. Userfriendly design for all skill levels: Easily attachable to most standard drills, no special tools or advanced skills required. Suitable for professionals and DIY enthusiasts to achieve precise, efficient drilling in metal, wood, and concrete. Versatile sizes and precision drilling: Our Diamond Core Drill Bit Set includes three sizes (20 mm, 35 mm, 50 mm) for precise hole enlargement. This versatility improves work efficiency across multiple projects and makes it essential for construction or renovation tasks. Use scenarios: Drilling large holes in metal panels or frames during fabrication or repairs. Routing through concrete walls or floors for electrical conduits or plumbing. Enlarge holes in wood beams or furniture for wiring, hardware installation, or decorative purposes.