Titanium key rings
TSRM size M 20.5/25mm
TSRL size L 26/32mm
 
Please note: Titanium ring is great at resist corrosion but it does not have same resilience like spring steel. Opening too wide will cause permanent gap that will never go back.
 
Maximum openings of these rings:
 
Size M: 4.5 - 5.0mm
Size L: 6.0 - 6.5mm