Mountain Bicycle Seat Post Clamp Accessories

Product information:
Specification: 31.8/34.9mm outer diameter
Material: aluminum alloy
Color: black/red/gold/Blue
How to buy:31.8mm seat tube clamp, suitable for seat post of 27.2/28.6 outer diameter, (part of the dead fly 27.2 seat Post use 29.4mm need to be measured).34.9mm seat tube clamp, suitable for seat post of outer diameter of 30. 4/30.8/30.9/31.6.
Note: the caliber size will be marked below most seat tubes.