The difference is in the detail as they say, and custom nuts will help set off your bike and make it stand out from the crowd. Nuts are available in metric and imperial sizes and include the distinctive Colony Pike nuts. UNC means the nut has a coarse thread and UNF stands for fine thread. All custom nuts are made from chrome plated steel for strength and premium finish. Chrome and stainless bolt kits can also be supplied for Harley-Davidsons, just ask.