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Features: 1.High-speed steel, high quality and durable to use. 2.5 Sizes in one drill bit set( 5# 6#,8#,10#,12#), which meet your different needs perfectly. 3.Convenient and quick to change the bits with the included hex wrench 4.Apply with a clamp or joint drilling machine, suitable for drilling in the hard wood and wood floor, machine screw for wood screw. Specifications: Material: HSS 4241( Ti Titanium-coated) Black chamfer drill body material: Steel 45 Dimension: size: Chamfer Drill 5# 2mm 6# 2.38mm 8# 2.75mm 10# 3.16mm 12# 3.55mm Shank: 1/4 Hex Shank, diameter of 6.35mm Material: HSS 4241 Color: gold Package Includes: 5 x Countersink Drill Bits 1 x Hex Shank