Classic safety chain is the successor to the proven ACH 2.0 and has a newly designed oval Loop-Ring. The slimmer shape makes it particularly easy to insert the chain through spokes or narrow openings - for an even more convenient connection. Double security: the already mounted frame lock blocks the rear wheels of the bicycle, but does not prevent the bicycle from being carried away. The connection chain is the ideal addition to secure the bicycle to fixed objects such as lamp posts or bicycle racks. For example, place the ADAPTOR CHAIN ​​Classic around the lamp post and insert it into the additional lock case of a compatible frame lock or the Alarmbox 2.0 - then the bicycle is doubly protected. No additional key is required for the plug-in chain. The key of the frame lock opens and locks both components. The hardened steel plug-in chain has a textile cover to protect the bicycle against paint damage.