Building a shop, - ground anchors .

I use a simple 1/2 inch "Red Head" brand anchor.

At least 4" into the concrete.

I have one at the back center line of half of my bays.

Haven't had any problems ever. One even pulls up hill.

I use a come a long or a harbor freight 2500# winch.

Those lag anchors are about $5 each but some times the Habitat Re-Store has them for $2.

The 1/2" by 12" masonry bit was the big expense.

Make sure you leave enough threads sticking out to put a nut, two heavy washers and the chain link, but not enough that the torque could bend the rod.

...and make sure you have at least a short lead of chain big enough to fit over a 1/2" stud.