I recently replaced a transom on my boat and bought several brands of closed end rivets like this one. These snapped into place with significantly more effort and finally burst. Almost twice as strong as another brand I've reviewed. I couldn't break them with a one handed pistol grip rivet gun, it required a heavy two handed block. This tells me it's a stronger alloy and offers significantly more clamping force than other brands. Riveting a jonbot isn't something you want to do multiple times or find you have a leaking seam due to a weak rivet.
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