AUTOMATIC PROTECTION WITH JUST ONE CLICK This 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-Chain™ 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 – job done. The bike lock is ideal for securing low-cost bikes and children’s bikes in areas with a low risk of theft.