You can change the height of your Nimbus Performer Giraffe with this extension.
Made of CroMo for extra strength with lugs for seatpost bolt and slot-key to prevent it twisting.
Fits 27.2 seat post tubes. (please check which diameter you need).
Comes with quick-release bolt.
A rough guide to heights on the Nimbus performer giraffe:
No Extensions = 5' (approx)
200mm Extension = 6' (approx)
400mm Extension = 7' (approx)