c Some of the more common bits are described below. The twist bit can drill through wood or metal (figure A). Use a high speed for wood and a lower speed for metal. The spade bit is used to cut large holes in wood (figure B). The carbide-tipped masonry bit is used to drill into materials such as brick and concrete (figure C). Glass and tile bits are used for drilling through smooth, brittle surfaces (figure D). Dab a mixture of silicone and mineral spirits at the point on the surface where you're drilling (figure E) to protect the surface. The bit extension is used to permit drilling into otherwise inaccessible places--for example, when drilling through a wall at an angle (figure F). It accepts any type of bit.
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