Features: Engineered with accuracy countersink design, this drill bit set creates accurate 3 10mm holes in woodworking projects, eliminating slippage for professional grades results every time. Crafted form HRC62 rate high speed steel, these sturdy bits outlast standard drill bits by 200% while maintaining sharpness through demanding applications like furniture crafting and construction. Designed for professional woodworkers and craft enthusiasts, the 1/4" hexagonal shank ensures generic compatibility with most power drills for seamless workshop or jobsites operations. Achieve unflawed joinery in cabinetry and woodcraft projects with the spirals fluted design that clears debris efficiently, reducing friction during prolonged drilling projects. Complete with a portable storage case, this 5 piece countersink drill set organizes neatly for mobile repair tasks while preventing edges damage between jobsites. Specifications: Materials: High-Speed Steel Shank Diameter 0.635cm/0.24inches, Length 5cm/1.96inches, 5.7cm/2.24inches, 6.1cm/2.4inches, 6.5cm/2.55inches, 7cm/2.75inches, Drill Blade Diameter: 2mm/0.07inches, 2.4mm/0.09inches, 2.8mm/0.11inches, 3.2mm/.012in, 3.6mm/0.14in Package Includes: 1Set High Speed Steel Woodworking Drill Bits note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!