It is an innovative set of drilling and conversion tools. There is no need toChange the drilling method. New bit design, the conversion of the locking is very precise and only takes a few seconds of drilling to drive. Suitable everywhere if you want. High hardness, rust-proof, solid and durable. Quick change composite taper, uses drill bits with base edges. Suitable for drilling, tapping, cutting into soft metal, aluminum plate, iron, etc. Self-centering point, no need for auxiliary center drilling or central punching. Drilling and tapping in one single-step processing, greatly save processing steps and time costs, improve work efficiency. Specifications:Color: Metal-gray. Material: 4341 high speed steel.Size: M3, M4, M5, M6 M8, M10Package included: 6 x Composite Tapping Drill Bit. Notes:Due to the different monitor and light effect, the actual color of the item may be slightly different from the color shown in the pictures.