We have a Salvaged Metal Round, vintage item.  I'm not sure what it came off of.  It is about 7" across the center with the center hole being about 3/8" across the opening.  The center is domed a bit with it being about 3/8" - 1/2" in H/d in the center where the hole is.  I'm not certain what type of metal this is - it weighs just over 10 ounces, it doesn't stick to a magnet.  There are surface scratches on it as shown in my photo's.  I was hoping someone could use/repurpose this.