The drill burrs and debris are then cleaned off, and the pieces assembled. If everything is just right (and a sixteenth of an inch off is way too much) then it can be set in a frame, trued up and welded.
When that's done, it's inspected and stamped with the location, and one more panel joins the growing pile!

I thought it would be fun to show the steps for building a railing panel- each one of these is like a piece of furniture!
First, having fetched a half a ton of steel, it gets sorted, stacked, and the work stand stocked up. Here's son Joe cutting components.
The sharp burrs left by the saw are cleaned up right away- these can be razor sharp!
The hole locations are laid out with a guide so that all are exactly alike, marked and center punched, then drilled with a pilot drill on the drill press, followed by a 1/2" drill.