Pylex13901 1 Step Stair Frame, Steel

I see questions on if for $25 this is a set of two or a single brace. please clarify. my assumption is for $25 i get two braces?

This does not come in a set - amazon wont let me post a review since i had to return the product

which portion is 16 inches? height from floor to top of steel support? or is 16 the depth of the finished step

How deep can the board be for the step?