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。

youdao

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。

youdao