Master Garden Products Teak Wood Even Top Solid Log Edging, 5 by 48-Inch

How do you secure these in the ground? I don't see any spikes.

What is the correct dimensions for this product? Website conflicting measurements.

What’s the diameter of each log?

To the seller, i need to buy two sets, but as of today (04/26/19) there's only one left. When will you have more available??