This 6-piece Box Chamfering End Mill Cutter set is a versatile addition to your tool collection. Featuring a 3 Flute Round shank and 90 Degree design, these HSS Countersink Deburring Tapered Drill Bits are ideal for a variety of applications. Made from high speed steel 4241, these bits are durable and efficient. They are suitable for workpieces with hardness below 25HRC, including carbon steel, thin iron plate, insulation board, PVC board, and wood board. The 3 flutes and 90° angle ensure precise and efficient chamfering, while the automatic through-hole chamfering cutters can quickly chamfer the two sides of the hole in just a few seconds. Additionally, the blades can be easily ground for maintenance without the need for unloading. Each set includes 6 tapered drills, providing you with all the tools you need for your projects.