Only the hole saw is sized large enough for a 4" hole.Holex appears to make a variety of cutters, including an annular cutter like this:
Simply buy HSS core drill Depth of cut 30 mm 50 mm | Hoffmann Group
www.hoffmann-group.com
They also make a hole saw, which I don’t think would be nearly as good:
Simply buy Carbide hole saw flat 50 mm | Hoffmann Group
www.hoffmann-group.com
Oh I see Val-Cut is a trepanning cutter. That seems tough in stainless.
What grade stainless?
How many holes?
What tolerance?
I think the only alternative is either a CNC with a high-speed carbide mill or a boring bar in a manual mill, unless you can mount the workpiece on a lathe fixture plate and bore it there.
Rick "pics would help" Denney