Summit usually keeps a close hold of their house brands. I suspect that it can always change too. If I had to suspect, I don't think they are Weiand, they are likely as you suspect Procomp or similar FWIW, I went to Harbor Frieght the other day and bought a dial indicator base, brought it home...it was EXACTLY the same as the one I bought from Summit. Summit is not against overseas made products. Just like anyone if the quality is good the value is good. Never had a problem with a Summit Branded part.