The brackets are heavy steel painted green.
The design allows you to make a composter that works for you location.
The corners are 36" high.
When constructed with 48"boards, the composting capacity is 48 cu.ft.
The construction will require 20 boards 1" x 6" x 48" (not provided)
One photo posted is a picture of the actual corners.
The other pictures posted are from a web site that sells this item.