【High Quality】--These diamond grinding heads are made of quality copper material, and the surface is plated with diamonds, that is, the bonding surface is double-plated to ensure no peeling, high strength, and long life, allowing you to use them with confidence 【Practical design】--Stained ceramic glass abrasive tool adopts a standard frosted design, and the brass core reduces shaft binding and will not stick to the shaft of the grinder.The drill bit is chrome-plated and hardened to improve performance, strength and durability 【Multi-size to choose】-- you will receive 1 piece of diamond grinding bit in size 3/4 inch, along with 1 matching hex key, different sizes and complete combination to fully meet your DIY use 【High Working Efficiency】--The hole diameter：8mm/0.31in. These diamond drill bits make the glass grinding faster and help the work to be completed more efficiently, which are really practical and necessary tools in your toolbox 【Wide Applications】--our stained glass drills are suitable for forming and drilling of hard materials such as ceramic tiles, glass, colored glass, stone, etc., also proper for shaping most types of glass, ceramic tiles, stone and similar materials, and work well for glass grinders of most brands Stained Glass Diamond Grinder Bit Head Tools BeQell 3/4 Inch Brass Core Stained Glass Grinder Bits,Stained Glass Drill Bits,Stain Glass Tools and Supplies for Stained Glass