Coated with high quality diamond particles, the T shaped design is perfect for engraving and cutting. Specific shank sizes are suitable for most rotary tools, die grinders, bench grinders. Made of diamond and alloy, it is strong and durable. Suitable for engraving and grinding of metal or non metal, such as stone, jade, glass and metal. You will receive 13 sizes (0.5 to 10mm) of grinding heads with shank diameters of 3/32 inch (2.35mm) that can be mounted on motors, engravers, lifts, drills, and pneumatic grinders. For long term use, use a lubricant with all diamond coated tools. Coated with high quality diamond particles, it is perfect for engraving, cutting and machining, allowing you to precisely shape abrasions and get the job done.