I got three Keholes a while ago at about 1".
#1 is nowabout 3". Rounded fins and no trailers.
#2 is about 2.5". Fins have thin trailers.
#3 is about 2.5". Rounded fins and no trailers.
#1 and 2 hang together a chase #3 a bit.
I assume that the larger #1 is female and #2 with the trailers...