Learn about the basic types of drill bits used for wood, metal and masonry.
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DK - Do It Yourself Home Improvement © 2009 Dorling Kindersley Limited
These are known as high-speed steel (HSS) bits and are characterized by their black color. More expensive, durable ones may contain cobalt or be titanium-coated. They can also be used on wood or plastic, but they last longer if reserved for metalwork.
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