[Material] Stained ceramic glass grinding tool features a standard frosted design, constructed from high-quality copper material with diamond plating for extended service life. [Grinding Bit Size] Available in 1 inch, 3/4 inch, 1/4 inch, and 0.31 inch inside diameter, includes 3 matching hex wrenches; the combination set fully meets your DIY requirements. [Excellent Design] The stained ceramic glass grinding tool features a standard frosted design; the brass core reduces shaft binding and prevents 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 suitable for shaping and drilling hard materials such as tiles, glass, stained glass, and stone. Compatible with various glass grinders. [High Efficiency] MCB01, MCB34, and MCB14 series diamond bits facilitate efficient glass grinding, improving work efficiency and serving as essential tools for your toolbox. 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 diamond plating, double-layer diamond bonding ensures 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 essential tools. 3. Glass grinder diamond bits are suitable for grinding stained glass and compatible with various glass grinders such as Gla-star, Gry-phon, Glass, 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. Package Contents: 3 x Glass grinder bits Note: Light reflection and display differences may cause slight color variation between the image and actual item. Measurement allows an error of +/- 1–3cm.