I bought the chain for the purpose of securing my bike in the garage. It makes a solid impression, with a good padlock it should be quite a barrier to an amateur of other people's property. The workmanship is unqualified. The only drawback (if you can call it that) - the chain links do not pass through each other. I.e. with a padlock you need to catch two, which limits the choice of padlocks.
CF 520l 2021 chain thick solid and long calmly enough to fasten behind the control arm. It has thick 13.5mm round eyelets. The shears are slipping. No chance. 3 keys solid padlock. A big impediment to theft.
Disc Lock very solidly and aesthetically made, very solid. Alarm very sensitive and loud.
After the alarm goes off once, you have to arm the alarm again with the key.