4 pcs 1in angle bar chamfer cut and welded to form square inverted pyramid with sturdy base, metal off-cuts.square pyramids made with 4 pcs. iron rod with single weld bead at tip should be self-supporting.pre-cut all iron rods to identical length using metal cutter, saw or angle grinder.16 pyramids required to fabricate one semi-octet truss.
AMP 
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