The fin fit perfect and works really well in the river. I appreciate that the screw is behind the fin so I don't worry about what it knock into. (it is a little harder to put in that way but not a deal breaker) I have an inflatable SUP and the rivers I love can run a bit shallow and rocky in places. This fin allows me to track and maneuver in the river without an issue and prevents me from bottoming out and going superman.