The HSS Countersink Set 90° Different Partition 6 Pcs (6.3, 8.3, 10.4, 16) is a set of high-speed steel (HSS) countersinks designed for creating precise chamfered holes in a variety of materials. Key features include: 90° Angle: The countersinks in the set are designed with a 90° angle, ideal for deburring and creating a conical shape at the top of drilled holes. 6 Pieces: The set includes 6 countersinks, each with a different diameter to suit a variety of applications. 6.3mm, 8.3mm, 10.4mm, and 16mm are the specific sizes, allowing for versatility in drilling different hole diameters and depths. HSS Construction: Made from High-Speed Steel (HSS), these countersinks provide durability and high-performance cutting ability, especially in harder materials like metal, wood, and plastic. Different Partition: The set offers different partitions or sizes, making it versatile for multiple tasks in industries such as metalworking, woodworking, and general machining. This countersink set is ideal for professional use in drilling, deburring, or creating angled edges in a range of materials, ensuring clean, precise results every time.