[Material]Stained ceramic glass grinding tool is of standard frosted design, made of copper material with diamond plated , and long service life. [Grinding Bit Size] The sizes are 1 inch, 3/4 inch, 1/4 inch, 0.31 inch inside diameter, and comes with 3 matching Hex wrenches, the combination set fully meets your DIY needs. [Excellent Design]The stained ceramic glass grinding tool adopts a standard frosted design, the brass core reduces shaft binding and 't stick to the grinder shaft; the drill bit is chrome-plated and hardened to improve performance, strength and durability. [Wide Application]Our diamond grinding tools are widely used for shaping and drilling hard materials such as tiles, glass, stained glass, stone and so on. It is also suitable for various of glass grinders. [High Efficiency]MCB01,MCB34,MCB14 series diamond bits can glass grinding and improve work efficiency, which is an essential item in 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 adopts a standard frosted design, and the Brass core reduces shaft binding and not stick to the shaft of the grinder ,Made of quality copper material, and the is plated with diamonds, Diamond abrasive bonding is double plated , high strength, and 2.The hole diameter 8mm/0.31in.These diamond drill bits in MCB01, MCB34, MCB14 make the glass grinding faster and help the work to be completed more efficiently, which are really practical and necessary tools in your toolbox. 3.Glass Grinder bits diamond bits can be used for grinding stained glass and suitable for many of glass grinder 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, Please Make Sure The Shaft Diameter of Your Grinder Must Smaller Than 8mm.<b