Final answer:
The two main types of twist drill bits are carbon steel bits, which are ideal for soft materials like wood and plastic, and high-speed steel bits, which are more durable, versatile and can withstand higher temperatures.
Step-by-step explanation:
The two main types of twist drill bits are carbon steel bits and high-speed steel bits. Carbon steel bits are ideal for drilling through wood, plastic, and other soft materials because they're cheaper and can be resharpened. However, they dull quickly when used with hard materials. On the other hand, high-speed steel bits are more durable and versatile. They can work with both harder and softer materials and are more resistant to high temperatures which make them ideal for repeated use.
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