I use these black wrought iron screws to add a rustic touch to fine art paintings that I do on slate. I attach the finished slate to a wooden plaque with the screws. I started with a package of 100 screws and now only have 2 left. Many compliments on the over-all look, including the screws. The screw threads are so cleanly cut that I can easily use them without having to pre-drill. I just use an awl to punch a guide hole to keep everything straight.