Features: Hexadecimal Shank 5Flute Countersink drill bit Set (12/16/19mm) ensures precise drilling control with its ergonomic hexadecimal handle, durability high carbon steel construction for flawlessly woodworking projects. Featuring five sharpened edges and three interchangeable size, this countersink set creates smooth chamfered holes through dense wood materials while maintaining optimal bit stability during operate. Professional carpenters and enthusiasts will appreciate this essential woodworking tool for cabinet assembly, furniture restoration, and precise joinery tasks requiring clean edges finishing. Perfect for workshop applications like installing hidden hinges, creating screw recesses in tabletops, or preparing wooden surfaces for seamless hardware integration in craft projects. Engineered with wear resistant carbon steel blade and sizing (12mm/16mm/19mm), this complete countersink drill bit set delivers professional results across softwoods and hardwoods alike. Specifications: Component:High-Carbon Steel Multiple Size as Picture Show; Tip: 12mm, 16mm, 19mm Handle diameter: 6.35mm (1/4inch hexagonal handle) Surfaces treatments: blackening treatments Heat treatments: overall high-frequency quenching Package Includes: 1Set/3pcs Five Flute Chamferer note: Please allow 1-3cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.