High quality products: Bicycle chain is made of metal material, good stability, excellent performance, not afraid of wear, not afraid of corrosion, not afraid of bad weather, not easy to break, long service life, suitable for long-term use.Chain Main Link Product Specifications and packaging: Purchase of 12 bicycle chains, 21mm/0.83inch long, 10.2mm/0.4inch high, is an efficient, precise and easy to use product, it effectively ensures smooth and powerful performance. Perfect for replacing old chains.Product Compatibility: Bicycle chain main chain is suitable for singular chain, compatible with all bicycle types of singular chain. Examples include mountain bikes, road bikes, including foldable bikes and mini bikes.Easy to work: The main link of the bicycle chain is easy to assemble and disassemble the chain, just disconnect the old link connector and connect the new one to use, you can quickly repair your bicycle chain, no staff, you can easily complete the repair.Bicycle chain quick link essential products: When your bicycle chain is suddenly damaged, you can quickly take out the purchased chain for maintenance, and it is also very convenient to carry out in daily life, lightweight and does not take up too much position, which is a necessity for the bicycle chain.