Using these 8mm chrome - plated metal LED holders is a breeze. First, take your 8mm LED and slide it through the opening in the holder. Then, put the plastic end on to cover the LED. After that, screw on the washer tightly so that the LED is held securely. When handling these holders, be careful not to apply too much force while screwing the washer as it might damage the holder. For maintenance, you can use a dry cloth to wipe off any dust. If there are stubborn stains, a mild soap solution can be used, but make sure to dry them thoroughly afterward. And remember, these packs come without LEDs, so you'll need to get your own LEDs for your projects.