It couldn't be easier - with this frame lock chain made of hardened steel, you have the ideal secondary security for your bike. The frame lock chain Adaptor Chain 2.0 by ABUS makes it especially easy for you to double-secure your bike: You simply have to put the chain around a fixed object, pull the end of the chain with the lock through the ring on the chain and then insert it into the lock housing of the frame lock or the Alarm Box 2.0. You don't need another key and a separate locking of the shackle is not necessary either. Thanks to the special sheathing of the ring, the paintwork of the bike remains protected when connecting it. The Adaptor Chain 2.0 fits all ABUS frame locks with additional lock housing as well as the Alarmbox 2.0.