Have you ever wanted to mount 5mm LEDs to the side of your board? We got these in for our RedBoard Edge and loved them. They are really just small pieces of plastic to hold your LEDs while bending the legs over. You'll notice that there is a small amount of room between the LED and the housing. Most LEDs come with a small lip around the base, so we needed to make the hole a bit larger to get that lip to fit, but they should work with any standard 5mm LED (with two legs).