ZFYQ Drill Tap Bits Set 1/4" HSS Thread Cutting Tool Hex Shank for Wood Plastic Thin Aluminium, 6 Pieces

6 sizes: M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5. 6 steel drill bits, suitable for drilling wood, plastic, fine copper, aluminium and other soft metals (5-6 mm), not for hard materials (e.g. sheet steel). Convenient fittings, 1/4 inch hex shank, quick and easy change. Self-centering point, requires no assistance to drill or punch the centre. Drilling and tapping at the same time, one-step machining. Significantly reduce processing steps, save time and improve work efficiency. When drilling a hole, water should be injected at the same time to cool the drill bit. This will help you increase the value of tutorials. If it is not possible to cool the drill while drilling, the drilling speed should not be too high and you should not drill too frequently. The composite tap is best used on bench drill or tapping. The thickness of the piece is less than 5 mm. When using, the lubricant is applied to the tap. If you use the hand drill, the thickness should be less than 2mm, otherwise the tap will break easily (because the hand drill can not always be operated vertically and at constant speed).