Military specks brass name plates (tags) engraved for NYC LaGuardia airport reconstruction project. Those are corrosion resistant tags so they will not be affected by weather conditions. Engraving channel is deep to ensure that scratches and any mechanical impact on the name plate will not affect text readability. Two mounting holes are drilled with countersunk to ensure easy flash mount to equipment cabinets. 
Thank you for Sharing nice post.This nameplates is whether good in all temperature?
Those are mil speck tags they can withstand any temperature up to the point when metal will start melting. Tags are laser engraved so unlike painting or printing there is no ink that can burn out or wash out.