Version 2 .... it's 3/8" steel plate , high strength low alloy a572 gr50 . They are sandblasted then yellow zinc plated . They didn't turn out as yellow as I though , they turn different colors depending how you look at them . Anyway they are super stiff , makes the aluminum ones feel like twigs .... but they come in just under 18lbs. I have 30 of them ready to go ..... $125 shipped (lower 48) I'll be using UPS 4 day so shipping won't be as fast as usual and I have to haul them to town . They will come with 6 stainless flange bolts .