I was a little worried that the solid copper nails wouldn't be stiff enough to hammer into the 2x stick when installing the copper caulking, but they work great and not a single bent nail. worked great. Avoid bimetal problems when working with copper and use these nails, they look great and will take on the patina of your copper plating/work as it ages. I definitely recommend these nails to anyone who needs perfection in copper.