Quantity: One set Specifications: Length 85 cm Thickness 4 mm Anti-saw and anti-cut: The bicycle chain lock is made of high-quality stainless steel. Wear-resistant, 4 mm thick and 0.7 kg in weight, it can effectively withstand strong blows from saw blades and other tools. Anti-theft: Upgraded version of the lock cylinder with precise structure prevents technical unlocking. 3 keys can be taken out after locking, so you won't forget Waterproof, anti-corrosion, and anti-rust: The wear-resistant cloth cover is waterproof, dust-proof, and anti-friction, providing a comfortable experience. The exposed parts of the surface are nickel-plated to effectively prevent rust. Versatility: perfect medium length and pressure resistance, can be used anywhere you want, such as bicycles, motorcycles, gates, stadiums, fences, etc. Portable: can be placed in a backpack Carry it in or hang it on your bicycle for easy portability. "