SurfStow SUPRAX Replacement Square Pontoon Rail Clamp 
SUPRAX Replacement Square Pontoon Rail Clamp
One replacement SUPRAX clamp for pontoon boats. *This item is a tension mount installation and it only works on pontoon rails that are “completely” square. Please note: some of the newer pontoon boats do not have completely square railings. These rail claims WILL NOT fit those style rails.*
Fits up to 1-5/8" in width.