Plastic on the head is for beauty only, mechanical parts are all metal. This tool works like a charm. I used it on a project where I installed over 80 rivets which, due to the nature of the rivets and the thickness of the material, required two "puffs" of the tool for each rivet, and it never failed flawlessly, not once once. If you have the space to use this type of riveting tool I highly recommend it.
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