This is the Plastic Locking Ring Pair for a Stressless Recliner by Ekornes.
Ekornes Part #: 08000100. This item includes 2 rings (one for each side of the chair).
This part is required to lock the Stressless recliner seat-back into place. Please see step #3 in the assembly instructions illustration below.
Bring your beautiful Ekornes Stressless recliner back into mint condition with authentic Ekornes parts from The Unwind Company.