This set includes 8 of the most popular shapes in a fitted case. With 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. 100% raw virgin tungsten carbide burrs which has super long life, 10 times the durability of other HSS cutters and 200 times the durability of small wheel. The hardness can reach HRC70, sharp and sturdy. Double cut style, the right and left helical flutes combine to produce a chisel type cutting tooth, this precision, when combined with precision grinders, results in smooth operation, fast metal removal and fine finishes. Widely used for metal working, tool making, model engineering, wood carving, jewelry making, welding, chamfering, molding, deburring, grinding, porting the cylinder head and sculpture. Include body shops, fabrication shops, brake shops, industrial shops, die makers. 8 Cemented Carbide Files 3mm