The Abus Chain Frame Lock Chain makes it particularly easy to secure your bicycle twice as safely: Simply wrap the chain around a fixed object, thread the end with the lock through the ring on the chain, and attach it to the lock housing. You won't need an additional key, nor do you have to lock the shackle separately. The Chain Frame Lock Chain is compatible with Abus Frame Locks 4960, 5850, 5650, and 5950.