Accessory: BODYSOLID OLYMPIC ADAPTER SLEEVE 20cm Robust Bodysolid adapters - can transform the inputs of your door discs from the standard 25 mm 50 mm all'olimpionico. This adapter is open on both sides and 20 cm long. Made of sturdy heavy nylon to ensure long life. Notes: sold individually Features OLYMPIC ADAPTER SLEEVE 20cm: Sold individually 25mm diameter input - output (external) diameter 50mm Color: Black