Check the listing for details. Roll-In Dock Wheel Kits - Square Kit for 4' Wide Dock. Condition: New. Listed at 249.99 USD. Time at the lake is precious, and lifting docks heavier than your boat will end your season with a hernia. Stop the madness.With nothing more than a wrench or two and 5 minutes of your time, you can convert your heavy, cumbersome old dock into an easy to install roll-in dock. Turn a 5 man job into a 1 man job with our kit shipped right to your door.Breathe new life into your dock, and yourself!Each do-it-yourself roll-in dock wheel kit includes:2 aluminum axle adapters (for either square posts or round) – Just slip over your existing round pipe (1.900″ max outside diameter for round pipe adapters) and tighten the set bolt.2 poly dock wheels – Some of the biggest and most robust wheels available, they roll over rocks easily with a monstrous 24″ diameter and 8 inch width.1 aluminum thru axle w/ retaining rings – Available for 3ft wide docks or 4ft wide docks.Time at the lake is precious, and lifting docks heavier than your boat will end your season with a hernia. Stop the madness.With nothing more than a wrench or two and 5 minutes of your time, you can convert your heavy, cumbersome old dock into an easy to install roll-in dock. Turn a 5 man job into a 1 man job with our kit shipped right to your door.Breathe new life into your dock, and yourself!Each do-it-yourself roll-in dock wheel kit includes:2 aluminum axle adapters (for either square posts or round) – Just slip over your existing round pipe (1.900″ max outside diameter for round pipe adapters) and tighten the set bolt.2 poly dock wheels – Some of the biggest and most robust wheels available, they roll over rocks easily with a monstrous 24″ diameter and 8 inch width.1 aluminum thru axle w/ retaining rings – Available for 3ft wide docks or 4ft wide docks.