If the speed it too fast for the particular project then you can damage your project. Different sized drills can handle a project better than others. It also depends on the types of materials you are working with such as concrete, metal, plastic, and wood. Do you want a drill that is fast or one that offers a great deal of torque? All Bosch power tools are guaranteed to be free from defects. Each comes with a one year warranty, a thirty day money back guarantee, and a one year service plan. Bosch offer reliable power tools at a very comparable price. Bosch power tools are very versatile and meet or exceed the required safety requirements of the industry. A respirator is recommended as well to prevent you from inhaling the dust. This is especially important if you are working at an angle where the dust is coming directly down on you, such as overhead sanding. You can also choose to purchase a dust bag for the sander. Wearing long sleeves is a good idea as well. It is less expensive than the cost of a medical visit. Others choose not to use safety equipment because they are in a hurry or because they are very comfortable using particular power tools. The specific safety equipment you will need depends on the power tool you are operating. Each instruction manual will have information on the recommended safety equipment you should have on when you operate that power tool. Moving the router too fast is dangerous as well because your work with be rough and you will likely break your bit. It will take some time for you to get the feel for the right amount of pressure and speed to use with your router. If you listen to the router closely you will be able to hear a different sound when you are operating it correctly. Where you plan to use the power nailer is something to consider as well. Do you have a power source readily available or will you be better off going with a cordless power nailer model? Pneumatic power nailers operate with air pressure that is supplied by a small air compressor. If you choose this type of power nailer, make sure you have an air compressor that is sufficient to handle the power of the power tool.