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西德Gunther公司研制了一种用于加工塑料和有色金属的新型麻花钻,其规格符合DIN1987和DIN338的规定.该种麻花钻的直径范围在3至10mm之间.除其总长度和沟槽长度(刃长)外,钻头直径尺寸间隔为0.5mm。刀具柄部和螺旋部分是由硬质合金制成。刀刃是
West Germany Gunther company developed a new type of twist drill for plastic and non-ferrous metals, the specifications in line with DIN1987 and DIN338 .This kind of twist drill diameter range between 3 to 10mm.In addition to its total length and groove Length (blade length), drill diameter size interval of 0.5mm. The tool shank and the helical part are made of cemented carbide. The blade is