Overall high frequency quenching, the hardness and resistance, enhances its wear resistance, high temperature resistance, cutting property. High hardness, smooth chip processing, can once fulfill the chamfering, deburring, and cone processing. It is a professional chamfering tool for batch processing, used for chamfering round holes and edges. Feature - Color: As shown - Material: High-Speed -Steel. - Package Size: About 7x2.2x2.2cm - Made of high-speed -steel material, high hardness, rustproof, solid and durable - The chamfering with a groove, easier to discharge debris and the Drill Bit not easy to blunt - High hardness, smooth chip processing, can fulfill the chamfering, deburring, and cone processing. Used for workpiece circular aperture chamfering or cone hole - It is suitable for holing chamfering the boards with low hardness, such as wooden boards and plastic boards. Do not use this product to chamfering the metal. - Idea for cutting through plastic, aluminum, copper, stainless steel, aluminum plate, insulation boards, and PVC sheet, . Package list: 5 x deburring bits