I could have used them about then as well. But I am now.
As for the size, here is what they measure.
Folded up = 5" long
The hook screwed all the way in = 2 1/2"
The hook unfolded with it screwed in measures = 3 1/4"
The hook will screw out about 7/8"
The back of base to the end of the hook screwed in = 5 1/4" total
Center of hook pivot to it's end = 4"
Folded up from end of hook to back of base = 4 1/2"
The hook is adjustable from the picture out longer. But the pull distance would be the same as closed. It would just reach out farther.
It appears to be the same as the ones with the round hook shaft, I've seen on Ebay and other places for around $10.00 to $14.00.
It pulls my door up tight now with now leaks between the gasket and the door.