Using the Tactica M.100 Multitool is a breeze. For the screwdriver, simply take the desired 1/4' tool bit from the internal chamber and insert it into the magnetic socket. You can then use it to tighten or loosen screws. When using the universal wrenches, place the wrench over the nut and slide it until you find the right size to fit. To open boxes, use the built - in box opener. As for the bottle opener, just hook it under the bottle cap and lift to open your drink. When it comes to maintenance, keep it dry after use to prevent the 420C stainless steel core from rusting. You can use a soft cloth to wipe it clean. Also, make sure to check the tool bits regularly and replace them if they become too worn out. Store it in a dry place when not in use to keep it in good condition.