Simson bicycle trailer coupling This bicycle trailer coupling ensures that you can easily connect the bicycle trailer to your bicycle. The coupling can be easily mounted to the saddle bolt of your bicycle. You can mount the end piece to the bicycle trailer and click it into the coupling. You can also easily disconnect the bicycle trailer. Specifications: Color: silver Material: steel Length: 8 x 4.5 x 5 cm (L x W x H) Product type: 021817 Contents: 1 Bicycle trailer coupling Mounting material