1.1.This carbide rotary burr set is an excellent choice for various applications such as metal and wood carving, engraving, polishing, drilling, jewelry making, welding, chamfering, casting, deburring, grinding, cylinder head porting, used in the mold proessing manufacture,machine parts bevel edge,inverted round and trench processing,the clean-up casting ,forging,weldment's edge,burr and welded joint. 2.The set includes 5 pieces of heat-treated tungsten carbide material with 12mm(1/2) head, which fits most rotary die grinders. 3.One of the great features of this carbide rotary burr set is the crossed groove lines on the head, making it more suitable for materials with relatively low density, such as wheel rims, wood, plastic, and aluminum. 4. The specially spaced flutes quickly remove materials such as aluminum, brass, bronze, and plastics without clogging. 5.The set comes with a storage case for safety storage and protection, ensuring that the working life of these solid rotary burrs lasts 10 times longer than high-speed steel and 200 times longer than grinding wheels. 6.The set includes different types of burrs such as the Flat Cylinder bur, which is perfect for straight edges and flat surfaces. The Flat Cutter Cylinder bur is ideal for straight edges, flat surfaces, and flat-bottom holes and slots. The Pointed Tree bur is perfect for curved surfaces and slots and curved holes with pointed bottoms. The Ball bur is excellent for curved surfaces, round slots, and round-bottom holes. Lastly, the Oval bur is great for oblong slots and holes.