The 3 mm LED Holder Plastic only needs the LED and the holder to be snapped into place easily and effectively, no screwing anything into place. These LED holders accept a 5mm LED and mount into 6mm diameter hole. These LED holders have a black plastic finish and make it possible to panel-mount your indicator lights for a clean look. These are handy for projects using individual LED’s as they look sleek, and your LED won’t budge.