I have a metal B&D "skil-saw" I bought around '73. I used it to build the house I presently live in .(yes, I built my own house).
I also used it on Summer jobs building decks, sheds, additions etc. for years. Ten years ago, I dropped it about 2 stories from an addition I was building and cracked the case, but pop-riveted a plate back in to hold it. Still going strong.