Inside Rail Guides (Set of 2)

Dock Blocks are floating plastic blocks that can be assembled to create a dock in the shape of your choosing. With Dock Blocks, you get: Easy assembly for DIYers Stable platform from patented connecting system Commercial grade durability from High-Density Polyethylene (HDPE) plastic material and patented system Customizable shape that is easy to reconfigure.  Ships within continental United States. Does not ship to HI or AK. Lifetime warranty Surface: Non-slip tread Maximum Weight Capacity: 220 lbs. per floater Used on V hull boats to help keep the boat straight and make it easier to get on and off the dock.