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both flush and extended are screw in chokes flush choke end at the barrel and require the use of a (included ) choke wrench to remove (in a pinch you can use a quarter to remove most 12 ga flush mount chokes) the extended choke extend past the end of the barrel and most have a knurled tip to make changing the choke easier and faster the normally will not require a wrench unless someone overtightened them

Jeffrey, Yes you are correct. The flush choke screws in and is flush with barrel end.

Jeffrey, yes Sir. A flush choke screws in and the end is flush with the barrel tip. Extended chokes extend past the barrel tip.