The part Rodrigo Esparza is holding is about the size of a deck of cards, machined from a single block of 7075 aluminum, and it is very nearly perfect.
He turns it over in his hands slowly, checking a chamfer at one edge with his thumbnail, bringing it close to examine the surface finish under the fluorescent light of the inspection room. It will eventually be bolted into a ground support assembly for a military aircraft. It must be within one-thousandth of an inch of specification across eleven critical dimensions. Esparza already knows it passes — his quality system flagged it green before it ever reached his hands — but he checks it anyway.