The Diamond Step Cone Core Bit (20–35–50mm, M14) is a professional‑grade drilling accessory designed for use with angle grinders. Featuring diamond brazed technology, it delivers superior cutting efficiency, durability, and precision when working with hard materials such as stone, granite, marble, and tile. Its step cone design allows for multiple hole sizes (20mm, 35mm, and 50mm) in one tool, making it versatile and cost‑effective. The M14 thread ensures secure attachment and compatibility with standard grinders. Ideal for professionals and craftsmen, this bit provides smooth drilling with reduced chipping and extended service life.