From left to right:
The wrench looking item isn't a wrench. The "handle" part of it is threaded...I'm guessing a piece of farm machinery.
A large washer.
2 square nails
?????
2 bullet casings. The end of one is stamped with an "H" and is rim fire. The other is a 44-40 and is stamped "D.C. Co." They are approx the same size.
12 ga Winchester brass