The Adaptor chain from ABUS makes it particularly easy for you to double secure your bike: All you have to do is pull the chain around a fixed object, thread the end of the chain with the clasp through the ring on the chain and then insert it into the lock body of the frame lock. You don’t need an extra key and you don’t need to lock the bracket separately. In 2.0 version, the loop ring has an additional coating to protect it from scratches.