They maybe standard parts polished as I know a lot of company offer services to send parts away to be high polished.
I'm thinking of getting a polishing wheel so I can polish up a lot of my own standard parts.
I think the service is there for those who can't or don't want to be bothered with the hastle of doing it themselves. Apart from the initial outlay on the polishing kit, it's just time so it's a lot cheaper to do it yourself and personally I get more satisfaction from that, than just buying an already polished part.
Threaded Mode