Fairly sure these are made by the same company who make eagles etc which are used all over the world especially by the yanks. Handful of people have used them on here and i havent seen a fault yet? afaik SCAT Are made in china also so wouldnt be surprised if they are the same. I used them on my 5E and there was no problems, they came with spec sheets, They where balanced to within 1gram like SCAT etc. Also picked up a set of SCATs for a 4e build i was going to do and they where the same end of the day a basic forged H Beam rod is not difficult to produce, As long as they are well forged and the surfaces are to spec size wise then they will be fine. If they are out of spec when you check before measurements, Send them back and get your money back...