Abus Frame Lock Plug-in Chain (Models 5850, 5650, 4960)Adding the Frame Lock Chain to your Abus frame lock is a very quick and easy way to double your protection against theft. Simply place the adapter chain around a fixed object, pull the end with the lock through the ring on the chain and attach it to the lock housing. You will not need another key, nor will you need to lock the shackle separately. The Frame Lock Chain is suitable for use with Abus frame locks 4960, 5850 and 5650. Features 6 and 8 mm