Review on Ceramic Coated Drive Gutter Screws by Lance Foster

Looks like good quality. Some of them had a 20 degree bend that could probably be ironed out. However, I should have paid more attention to size #14 as the threads are only 1/4" in diameter, just like the studs I removed. They should work fine for new gutters/holes but not as replacements if you plan to reuse bolt holes.