I will call these saddlebag planters for lack of a better name.
They fit on the 4 side of a 2x4 rail. Length is 25"
The first pic shows the top and bottom.
The second pic shows some in use in my backyard.
Daytime porch pickup.
Rail Planters (Royal York/Norseman)
This offer has been gifted to someone and is no longer available.