We are Lianyungang Huayun Structural Materials Co.,Ltd China. We manufacture The Scaffolding and its Parts for many years. The Coupling Pin,Joint Pin we supplied with many specification such as (Length) 200mm,220mm,226mm and so on. By the way other specifications are acailable at the customer's request. If you have any demand or questions you can contact us freely. Your contacting will be appreciated. We look forward to cooperating with you.