Overkill Heavy Duty Dock Springs are made using one inch diameter steel round bar for the compression link instead of the 3/4 inch normally used and a set of 1800 lbs./inch compression rate brand new truck springs.  These Overkill springs are more than enough for large heavy docks with concrete paver surfaces on open bodies of water.  They come as a pair with 2 new 3/4" D anchor shackles, ready to install.   Because... overkill us underrated.   I also refer to these as the "Ozark Heavy Duty Dock Springs".  I made them for the conditions that dock owners are reporting on their lake.  

These weigh 55 pounds each and will require shipment in two packages.  Your UPS guy would hate you if I sent both in one box.