bits of iron for sure., you need some known object such as a quarter next to the samples for a size reference.
better in focus pics from different angles .
top left looks like a farm gate hinge.
top right is a fence staple ,
just below it is a bong poker
The bottom right item has the shape of a spur rowel , clock gear or a bottle cap. but the pics lack detail.
the rest is just bits of scrap metal . it's good to get those out of your way so you can find the good stuff.