This headboard arrived today and will be attached to the Avah Bed Frame also sold by Wayfair. The appearance of this headboard did not disappoint. It appears just as its online image.

The support uprights are wooden, probably 3/4" thick. The bolts that shipped are not long enough to go through the wooden uprights and the thickness of the Avah frame. The bolts that shipped are described as "Allen bolts M6 50mm."  I don't fault the headboard manufacturer, because the Avah bedframe is made of hollow steel - not the standard $79 steel rails that most mattress shops sell.  I'll simply pick up some 3-inch bolts of same diameter at the hardware store and all will be good.