he Adaptor Chain from ABUS makes it really easy to make your bicycle twice as secure! Simply place the chain around a fixed object, pull the end with the lock through the ring on the chain and attach it to the built-in lock on your frame. You won't not need an extra key, nor will you need to lock the shackle separately. This great product is designed for use with ABUS frame locks 4960, 5850, 5650 and 5950, but also works almost every brand of built-in lock.
8mm thick, square chain made of hardened steel
Separate locking of the shackle is not necessary
Opens up a lot of opportunities for locking the bicycle on to a fixed object