The trailer looks very cool, is processed pleasing good for a Chinese product and feels high quality. The diameter is about 3.5 cm. The supplied chain is against absolute scrap - much too short and of poor quality. However, this is not a problem in my case because I wanted to tinker a key chain anyway. A little tip: If you buy the chain in Hong Kong or China, you expect a fairly long lead time. It took me about 3 weeks until the part by registered letter arrived for me. Incidentally, it is also possible to order amazon.uk (credit card required) - I bought my chain there because they offered cheaper there.
