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