Shudehill Plain Satin Silver Classic Photo Frame A4-21" x 29.7"

Is this a hanging frame? or does it have a rest on the back?

Is this frame international A4 size or US letter size?

Does it fit a 8.25" x 11.75" certificate or it really for an 8 x 10 photo/document? My certificates are truly A4 in size.

Does this have 8.25” x 11.75” opening without mat ???