The Bosch 3 Piece Countersink Bit Set is a professional HSS countersink set designed for smooth, chatter-free countersinking and deburring in soft materials, including wood, plastics, and non-ferrous metals. Each bit features five 90-degree cutting edges ground from HSS (high-speed steel), delivering an optimum surface finish across all three diameters. This multi-edge design ensures continuous, burr-free cutting without chatter — ideal for carpenters, joiners, and contractors who need clean, consistent countersinks for screw fixings. The cylindrical shank is compatible with standard three-jaw drill chucks, making these bits straightforward to fit to most corded and cordless drills. With three diameters included, the set covers a practical range of screw sizes in a single purchase. Features and Benefits: • HSS construction provides optimum surface quality in soft materials • Five 90-degree cutting edges for smooth, chatter-free countersinking • Burr-free results suitable for wood, plastics, and non-ferrous metals • Cylindrical shank compatible with standard three-jaw drill chucks • Three diameters included for versatility across common screw sizes Specifications: Diameter: 8mm, 10mm, 12mm Total length: 50mm Shank diameter: 6mm, 8mm Net weight: 0.058kg Contents: 8mm diameter countersink bit 10mm diameter countersink bit 12mm diameter countersink bit