That is a modified pitman arm for sale on a website for a Jeep (Wrangler). From the description on their web page they TIG welded the original pitman arm cut-off piece to the mild steel 1/4" thick plate and MIG welded the rest of the steel plates together. That modification is done to convert the pitman arm to use a Heim/Rose joint on double shear and give higher articulation angles etc.I might be incorrect but this how i feel about highly engineered alloys