This kit contains 2 3/8” nylon lock nuts, 2 2” washers, 1 2” washer with holes drilled in it and 4 pieces of weed whacker string. You will still need: 1 piece of 3/8” threaded rod ~24” long, a 5 gallon bucket with lid, 2 wrenches/vice grips and a drill.

For assembly directions see this page

If you are already paying shipping for a nursery order this kit will save a little time and money. If you have to pay shipping on the kit you might as well just buy the parts at the local hardware store.