The bike lock is made of heavy-duty steel known for it cut resistance. Which is made with a hardened zinc alloy cylinder, which is not easily damaged and can withstand bad weather and most thieves. With security steel chains, it is more difficult to be attacked with power tools. The key can only be pulled out after the bike chain lock is locked, which prevents the key from being lost. The bike is equipment with 2 keys. You can take one of the keys to use in daily life, and you can leave another key at home in case you accidentally lose one. With 8mm thicker security heavy-duty chain links, our bike lock is made of heavy-duty steel known for its cut-resistance. Lubricate the bike chain lock hole and keyhole regularly, this will prolong the lock's service time. The total length of the bike chain lock is about 3.9 feet, enough to lock 4 bikes together, ideal for bicycles, bike, bikes, scooters, skateboards, motorcycles, ladders, lawnmowers, gates, fences, toolboxes, BBQ, sport equipment and many others against theft. The size is lightweight and very easy to carry. You can wrap it around your bicycle when you don't need to lock your bike. Gender: male. Age Group: adult.