高速钢麻花钻
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High-speed steel two-flute twist drills 高速钢双凹槽麻花钻
Twist drills are usually made of high-speed steel, although carbide-tipped drills are also available.
虽然也有硬质合金刀尖的钻头，麻花钻一般用高速钢制成。
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