[Material] Stained ceramic glass grinding tool features a standard frosted design, constructed from high-quality copper material with diamond plating for extended durability and long service life. [Grinding Bit Size] Available in 1 inch, 3/4 inch, 1/4 inch, and 0.31 inch (8mm) inside diameter. Includes 3 matching hex wrenches, providing a complete set for various DIY applications. [Excellent Design] The stained ceramic glass grinding tool incorporates a standard frosted design with a brass core to reduce shaft binding and prevent sticking to the grinder shaft. The bit is chrome-plated and hardened to enhance performance, strength, and durability. [Wide Application] These diamond grinding tools are ideal for shaping and drilling hard materials such as tiles, glass, stained glass, and stone. Compatible with a range of glass grinders. [High Efficiency] MCB01, MCB34, and MCB14 series diamond bits are designed for efficient glass grinding, improving work efficiency and serving as essential tools for your toolkit. Product Specification Type: Diamond Grinding Wheel Shaft Hole Diameter: 7.9–8mm Material: Metal Color: As shown Size: 1 inch, 3/4 inch, 1/4 inch 1. The stained ceramic glass abrasive tool features a standard frosted design. The brass core reduces shaft binding and prevents sticking to the grinder shaft. Made from quality copper material with double-layer diamond plating for high strength and durability. 2. Hole diameter: 8mm (0.31 inch). MCB01, MCB34, and MCB14 series diamond bits enable faster glass grinding and improved efficiency, making them practical and necessary tools. 3. Diamond grinding bits are suitable for stained glass grinding and compatible with various glass grinders such as Gla-star, Gry-phon, Power-Max II, and In-land Grinder. 4. The shaft hole diameter of all bits is 7.9–8mm. Ensure your grinder shaft diameter is smaller than 8mm for proper fit. Package Contents: 3 x Glass grinder bits Note: Light reflection and display differences may cause slight variations in color between the image and actual item. Measurement may vary by +/- 1–3cm.