Tommy Docks Normal Duty Muck Footpad is designed for use as a base with the Tommy Docks dock post pipe for soft or semi-soft lake bottoms where the soft lake bottom soils do not exceed 12 in. in-depth. Keeps your dock from sinking in soft soils once it settles. Reduces the need for constant readjustment of dock height due to sinking. Use with Tommy Docks dock post pipe of 1.66 in. in diameter Stainless steel adjusting bolt & weld nut allows for regular adjustment if required | Tommy Docks Muck Footpad 14" Square - Normal Duty (2-Pack)