Sorry, you’re right :person_facepalming: I just read the length part! 
Here it is: tail and head diameter = 19.8mm ; “base of the head” = 20.4mm 
Hope this helps! And thanks for your words 
Hum…now I don’t know what to expect from mine! I’ll tell something when mine arrives!
And… I guess lots of people here will be saying too
:money_mouth_face: