Label/tag a shackle

What is the best way to label/tag a shackle?

Reply from another Onix Work user:
Before, my company used batch number on them and no other distinguishing mark.

Often we may have 10 shackles with the same batch number, and we placed a multiple after that (eg S02102019 x10).

Now, my company has switched to Onix ID (Version with RFID), it can be used to uniquely identify these types of equipment.