When I bought this Powrarm I thought it was painted silver. It was really dirty so I started cleaning it up and when I hit it with a wire brush I realized that it wasn’t painted at all. It had obviously been sitting for a long time but there was no rust. It looks like it’s cast aluminum but feels too heavy to be aluminum. And everything looks to be made out of the same material except for the vertical shaft inside which is obviously steel. It weighs 11 pounds and 7 ounces. Which ma...kes it 9 ounces heavier in the model 311 that I have posted which is cast-iron. I don’t know what to make of it. It looks super cool though. I can’t find any others that look the same online. If anybody has any more information on this I would appreciate hearing about it. It’s in really good condition functions as it should in every way. The base is 6 inches wide the mounting attachment that comes with it is 3 inches in diameter. See pictures for further detailsFree shipping within the USAAny international shipping will have to go through eBay‘s global shipping program. They will charge additional fees.