Merritt-Theory Quickie Quick Release Seatpost Clamp-Red

6061 Aluminum quick release seat clamp 
Sizes 28.6mm, 31.8mm or 34.9mm
-28.6mm clamp fits 25.4mm post/28.6mm = 27.8mm - 28.8mm diameter seat tubes

-31.8mm clamp fits 27.2mm seat post/31.8mm = 30.2mm - 32.1mm diameter seat tubes

-34.9mm clamp fits 31.6-31.8mm/33.5mm - 35.2mm diameter seat tubes