Parallels (engineering) — Engineering parallels are rectangular blocks of metallic, typically Instrument steel, stainless steel or cast iron, which have 4 or 6 faces ground or lapped to the exact surface area complete. They can be made use of when machining with a miller, drill or another… … Wikipedia com https://leftbookmarks.com/story14009205/helping-the-others-realize-the-advantages-of-engineering-inspections