The Hanboost 30-Piece Diamond Grinding Bit Set provides a complete assortment of 120–150 grit diamond burrs designed for precision jewelry making, engraving, carving, and detailed DIY craftwork. Each burr is made from durable alloy steel and coated with tough diamond particles, delivering sharp, consistent cutting and superior wear resistance. With essential shapes such as ball, cone, cylinder, needle, and tapered, this set covers all standard carving and shaping needs. The universal 2.35mm (3/32") shank fits most rotary tools, ensuring stable rotation and smooth operation across a wide range of materials, including wood, metal, resin, stone, ABS, PVC, and plastics. Whether you're repairing jewelry, refining models, engraving stones, or crafting intricate designs, this diamond burr kit offers versatility, precision, and reliable performance for hobbyists and professionals alike.