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| 1 | A bit or drill used to set the head of a screw at or below the surface of the material. | 
 
 
| 2 | A small lever switch or part that you push or pull to activate a locking catch or spring. | 
 
 
| 3 | tools powered by elereicty. | 
 
 
| 4 | A method of testing the condition of a grinding wheel. | 
 
 
| 5 | A small, T-shaped steel piece used to open and close the chuck on power. | 
 
 
| 6 | Building material such as stone brick or concrete block. | 
 
 
| 7 | Gunpowder cartidge used to power powder- actuated fastening tools. | 
 
 
| 9 | The number of times or rate a motor componet or accessory drill bit completes one full rotation every minute. | 
 
 
| 11 | A granular abrasvie used to make sandpaper or appled to the surface  of a grindnig wheel to give it a nonslip finish. | 
 
 
| 19 | A very hard material made of carbon and one or more heavy metals. Commonly used in one type of saw blade. | 
 
 
| 21 | the smooth part of a drill bit that fits into the chuck. | 
 
 
| 23 | A tool with a sprial cutting edge for boring holes in wood and other materials. | 
 
 
| 24 | A clamping device that holds an attacment; for example, chuck on power drills. | 
 
 
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