【Waterproof, Anti-corrosion and Anti-rust】 The wear-resistant fabric protective cover is waterproof, dustproof and anti-friction, providing a comfortable using experience. The exposed part of the surface is nickel-plated to effectively prevent rust. 【Anti-theft】 The upgraded version of the lock cylinder has a sophisticated structure to prevent technical unlocking. The 3 keys can be taken out after being locked to avoid forgetting. 【Wide Usage】Perfect medium length and compression resistance, can be used anywhere you like, such as bicycle, motorcycle , gate, gym, fence, etc. 【Portable】Medium-sized design, can be put in a backpack or hung on a bicycle, easy to carry.