The PTI 4pc Grooved Taper Deburring Countersink Set is designed to create clean, accurate conical holes with a smooth, burr-free finish. Featuring an 82-degree chamfer, these bits provide a perfect recess for countersunk screw heads. The set includes four sizes, ranging from 2mm to 20mm, suitable for wood, plastic, aluminum, and other non-ferrous metals. The grooved design allows for efficient chip removal, preventing clogging and making deburring and countersinking more effective compared to standard countersinks. Key Features: Chamfer: 82-degree angle for precise countersinking Sizes: Includes 2-5mm, 5-10mm, 10-15mm, and 15-20mm bits Compatibility: Ideal for wood, plastic, aluminum, and other non-ferrous metals Efficiency: Grooved design for efficient chip removal and burr-free results Storage: Supplied in a sturdy metal storage box