Rotor thickness minimum 4-piston KH?

https://www.ebay.com/usr/brakelabs

These rotors seem very nicely machined, and a better deal than no-name stock replacements. They are zinc coated so the edges won't rust like the stock ones.

They do not come with hubs — I had them pressed on by a machine shop. I swapped in RH thread studs while I was at it.

I bought a set of similar rotors about 15 years ago that were made in USA and I was very pleased with them. No fade, no warping, handled hard braking at Willow Springs circuit. They went out of production, but then this brand showed up. I suspect they are made in China, but I don't actually know for sure.