【PREMIUM CARBIDE BURRS SET】: This set includes 8 of the most popular shapes in a fitted case. With a 1/4 inch shank, suitable for processing various metals and most rotary grinders. Excellent choice for precise metal removal when shaping, leveling, or porting cast iron, steel, and other ferrous metals. 【ADVANCES TUNSTEN MATERIAL】: 100% raw virgin tungsten carbide burrs whose service life is very long, 10 times the durability of other HSS burrs and 200 times the durability of small wheel. The hardness can reach HRC70, sharp and sturdy. 【PRECISE DOUBLE CUT】: Double cut style, right and left helical flutes combine to produce a chisel-like cutting tooth, this precision, when combined with precision grinders, results in smooth operation, fast metal removal and fine finishes. 【WIDELY APPLICATION】: Widely used for metalworking, tool making, model engineering, wood carving, jewelry making, welding, chamfering, casting, deburring, grinding, cylinder head porting and carving. Include body