Automatic protection with just one clickthis bike lock has a practical automatic closing function. This makes locking quick and easy without the need for a key. The chain lock steel o chaintrade 4804k is the perfect choice when time is of the essence. The automatic cylinder allows the bike to be locked without a key. Simply open the lock and press the locking bolt into the lock body ndash job done. The bike lock is ideal for securing low cost bikes and childrens bikes in areas with a low risk of theft.technology4 mm thick square chain with textile sleeve that prevents damage to paintworkthe chain is made of specially hardened steeloperation and usebasic protection at low theft riskrecommended for securing low range bicycles and childrens bikestransporteasy to transport around the seat postfor protected transportation we recommend for example the frame bags st 2012 or st 2200tipsvery easy handling because the lock can also be clicked shut without needing to insert the key