jamesinc;133267 wroteBy staino do you mean bluing the steel?
No, apologies, staino as in short for stainless steel, it's colloquially used by pipeys, ie, pipe fitters! Boileys for Boilermaker. Sparky for electrician etc.
Pix show, in no particular order, the reasonable brushed finish, its good enough for the use of the object.
Then masked with a laser cut bit of staino as template in the media Blasting cabinet then closeup of the finish it gives.
A wipe wipe staino polish oil and it's good!