Features:
Used to connect the circular tube fixed, 
Need to use glue on the Bottom Tube
Material:Plastic
Color: Black

Specifications:
  12-16mm suitable for external locking of 12 thin tubes and 16 thick tubes
  19-22mm suitable for external locks of 19 thin tubes and 22 thick tubes
  22-25mm is suitable for external locks of 22 thin tubes and 25 thick tubes
  25-28mm is suitable for external locks of 25 thin tubes and 28 thick tubes

Note: 
Need to use glue on the Bottom Tube
Please allow slightly measuring deviation due to manual measurement.

Package included:
4pcs x Plastic connector

Note:
- There exsits errors as manual measurements.