Upgraded Glass Grinding Machines for Stained Glass, Stained Glass Drill Bits, Stained Glass Diamond Grinding Bit Grinders 40JEOOTDTYechs: The drill bit is chrome plated and tempered to improve performance, strength and durability.3pcs diamond grinding bits in 3 sizes, namely, 1 inch, 3/4 inch, 1/4 inch, together with 3 matching Allen wrenches, various sizes and a complete connection to fully meet your DIY needs. Make glass grinding faster and make your work more efficient, which is really a practical and indispensable tool in your toolbox. Stained glass drill bits are suitable for forming and drilling hard materials such as ceramic tile, glass, colored glass, stone, etc. Made of high-quality metallic material, and the surface is coated with diamonds, with high strength and long service life. Specifications: Material: Metal + Diamond Size: 1 Inch, 3/4 Inch, 1/4 InchPackage Included: 3X Diamond Grinder BitNote: Please allow 1-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.