I bought a set of these brackets several years ago, packaged with four brackets to build two saw horses. I ordered them again, because, after several years, one of the plastic brackets broke (mostly from age--I'm satisfied with the durability). I decided to replace all the brackets.
I did not read the info carefully, my mistake: The order only includes two brackets. Enough for only one sawhorse.
I don't know about you, but most my work requires two sawhorses. Maybe a unicyclist can work on one sawhorse.