Comprehensive 4piece chamfer drill bit countersink set. The set includes sizes ranging from 25 mm to 1520 mm with shank diameters from 6 mm to 12 mm, providing versatility for drilling tasks across multiple materials. Precision engineering. The bits are designed with a 90degree point angle for accurate countersinking of circular apertures and cone holes, delivering consistent results. Reliable materials. Made from speed steel (HSS) with a titanium coating, these bits are built for durability and long life in demanding use. usage. For results, use a bench drill instead of a hand drill to minimize shaking and enhance the chamfering effect for precise outcomes. Key benefits. Enables flush screw seating and clean chamfers across wood, metal, and plastic; sizes cover common countersinking needs; robust HSS with titanium coating for durability. Applications Wood furniture and cabinetry assembly: countersink screw holes for a flush, professional finish. Metal sheet or aluminum panel work: create precise countersinks for panel fasteners and cone holes. Plastic enclosures and hobby projects: deburr and chamfer edges for smooth assembly and appearance.