| A | B |
|---|
| Abrasive | A substance—such as sandpaper—that is used to wear away material |
| Alternating current | An electrical current that reverses its direction at regularly recurring intervals; the current delivered through wall plugs. |
| Auger | A tool with a spiral cutting edge for boring holes in wood and other materials. |
| Booster | Gunpowder cartridge used to power powder-actuated fastening tools. |
| Carbide | A very hard material made of carbon and one or more heavy metals. Commonly used in one type of saw blade |
| Chuck | A clamping device that holds an attachment; for example, holds the drill bit |
| Chuck key | A small, T-shaped steel piece used to open and close power drills. |
| Countersink | A bit or drill used to set the head of a screw at or below the surface of the material. |
| Direct current | Electrical current that flows in one direction, from the negative (-) to the |
| Electric tools | Tools powered by either an AC source (wall plug) or a DC source (battery). |
| Ferromagnetic | Having magnetic properties. Substances such as iron, nickel, cobalt and various alloys are ferromagnetic |
