[. . . ] They are double-insulated in accordance with European Standard and can, therefore, also be used from sockets without earth wire. Safety hints For your own safety, please refer to the enclosed safety instructions. Do not touch the bit or the workpiece immediately after operation; they may be extremely hot and could burn your skin. [. . . ] For continuous operation, pull the switch trigger and then push in the lock button. To stop the tool from the locked position, pull the switch trigger fully, then release it. A speed control screw is provided so that maximum tool speed can be limited (variable). Turn the speed control screw clockwise for higher speed, and counterclockwise for lower speed. Lighting up the lamps (HP2050F, HP2051F) CAUTION: Do not look in the light or see the source of light directly. Be careful not to scratch the lens of lamp, or it may lower the illumination. , move the action mode change lever to the position of g symbol to use "rotation with hammering" action. Do not apply more pressure when the hole becomes clogged with chips or particles. Instead, run the tool at an idle, then remove the bit partially from the hole. After drilling the hole, use the blow-out bulb to clean the dust out of the hole. 9) Drilling operation When drilling in wood, metal or plastic materials, move the action mode change lever to the position of m symbol to use "rotation only" action. Drilling in wood When drilling in wood, the best results are obtained with wood drills equipped with a guide screw. The guide screw makes drilling easier by pulling the bit into the workpiece. Drilling in metal To prevent the bit from slipping when starting a hole, make an indentation with a center-punch and hammer at the point to be drilled. In fact, this excessive pressure will only serve to damage the tip of your bit, decrease the tool performance and shorten the service life of the tool. There is a tremendous force exerted on the tool/bit at the time of hole break through. Hold the tool firmly and exert care when the bit begins to break through the workpiece. A stuck bit can be removed simply by setting the reversing switch to reverse rotation in order to back out. [. . . ] CAUTION: These accessories or attachments are recommended for use with your Makita tool specified in this manual. The use of any other accessories or attachments might present a risk of injury to persons. The accessories or attachments should be used only in the proper and intended manner. [. . . ]