Features: Effective Diamond Core Drill Bit: Our diamond core drill bit ensures precision and efficiency, effortlessly drilling through tough materials like metal, concrete, tile, and marble for all your home improvement needs. Multi-Layer Conical Hole Opener: Designed for versatility, this multi-layer conical hole opener expands holes smoothly from 20mm to 50mm, making it ideal for both professional projects and diy tasks around the house. Easy Installation Durable Core Drill Bits: Experience hassle-free installation with our durable core drill bits, engineered for long-lasting performance and reliability, saving you time and effort on every drilling job. Diamond Stepped Pagoda Drill Bit: The diamond stepped pagoda drill bit provides superior cutting power and stability, ensuring clean and precise holes in granite, quartz, and engineered stone for any renovation project. Perfect For Home Improvement: Whether you're a diy enthusiast or a professional , our expanding drill bits are perfect for tackling various materials, making them essential tools for any home improvement project. Specification: Material: Steel Diameter: 20/35/50mm Notes: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor an brightness. 2. Please allow slight manual measurement deviation for the data. Include: 1*Effective Diamond Core Drill Bit