We purchased to of these benches for installation outside of a church nursery. The picture with this review shows the 4-foot model with two braces, but we bought the 6-foot models with three braces. It is not apparent in the picture, or the description, but the bench-tops actually consist of four, separate "beams", each of which is attached to the the three posts by three lag-screws. The beams 3.5"x3.5"x6' and have about the same density as pressure-treated 4x4's. Posts are made from 1/4" plate steel, and have a nice, heavy, glossy black powder-coat finish. When installing these benches, let me suggest that you attach all the "beams" to the posts, but don't cinch down the lags, at first. Position the pre-assembled bench where you intend to install it, square-up the posts, and mark for your anchor holes. Once you have the bench anchored, torque-down the the lags. We anchored them to four-inch thick concrete slabs with two 1/2" galvanized sleeve anchors in each post. Just guessing, but they can probably support several tons each. Certainly up to the abuse meted out by toddlers and pre-schoolers.
