1st image shows what 3pc legs would look like on a planter. These can be used to make a plant stand/base.
Wood is unknown, but it's solid.
One set is shiny and 12in. The other set is matte and 10in long. Both are tapered, 1.75in at top with hole for screw or bolt. 1.25in at top with cross indent to align a rubber tack foot if desired.