Features: 100 Percent brand new and noble quality. Suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc. Fast replacement composite cone, uses drill edged principle. Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve working efficiency. Self-centering point, do not need assistant center drilling or center punching. High hardness, rustproof, solid and durable. Specifications: Material: HSS Shank diameter: 6.35mm hex shank(1/4) Color: silver tone Full length: 56mm Blade length: 28mm Shank length: 30mm Blade diameter:6-32NC(3.5mm) Weight:about 8g/pcs Package Included: 10x Hex Shank HSS Drill Bit & Screw Tap of Imperial Units