I am a new owner of some rental cabins in Michigan. We'd like to offer
our renters the opportunity to moor a small boat or jet ski while they
are staying with us. The lake itself is very shallow for quite a ways
from shore. Our neighbor has moorings in the ground that have chain
and a buoy attached to them. My question is where do I buy the screw
in *thingy*? I really don't even know what it's called but I'll
describe it. It's about 4 ft long with a loop on one end and a round
metal plate on the other end that is notched and bent up to facilitate
threads to screw in the ground. If anyone can help me out I'd greatly
appreciate it.

Thanks!!