Once nice thing about Harley-Davidson motorcycles is that many parts have remain largely unchanged for decade after decade. The fork tube caps / nuts are one of these items, using a 1-3/8" hex on Harley-Davidson Big Twins (FL, Dyna, Softail etc) as well as Sportsters 1987 & later.. Many people don't have a large enough socket or the proper wrench to install or remove their fork tube caps, so we decided to make one out of heavy-duty stainless steel, in the USA, and sell it at an affordable price. Now there is no excuse for using channel locks on your beloved motorcycle!