Ok so im new to metal detecting. had my AT Pro about 3 weeks now and have had some time to get used to it and what its telling me. Went to the In-Laws house in Tobyhanna PA, for a birthday party and figured since the wifes dad was gonna tear up and re level the back yard he would let me dig into it. He sure did and i found 12 cents in clad, an aluminum clamp, a whole 6 foot length of aluminum siding, brown, and what seems to be a large weight of some sort. Its about 2 feet long, 6 inches thick with some holes that go all the way through. Well this damn thing weighed about 250 lbs, not even close to joking. Took three of us to lift it up and out But i have no idea what it is. Someone said it may be a counter weight for an old farm tractor.