It is considerably sturdier than I thought, it has weight. Because the length is long, not only the main body, but also the front and rear wheels can be connected well to the pole etc. It will also help prevent theft. There is a pedestal that can be fixed to the seat pillar of the bicycle. However, it will be heavy weight, so it may be unsuitable for sports bikes. I think that it is suitable also for mopeds and motorcycles. It is especially recommended for those who lose the key because it is a type that matches the numbers as it is worth the price.