Name: Locking seat tube clamp
Material: aluminum alloy
Color: black/red/gold/silver/blue
Weight: 21g
Size: 31.8/34.9MM

Specification:
Caliber 31.8MM, suitable for 27.2/28.6 seat tube (only suitable for
most aluminum alloy frames, steel frame and carbon frame are not
applicable!)
Caliber 34.9MM, suitable for 31.6/30.9/30.8 seat tube (only suitable
for most aluminum alloy frames, steel and carbon frames are not
applicable!)