These are NAIL STUDS and are not designed for steel or metal doors. Nail studs are sold in packs of 12. Studs are designed for any solid wood application and not for metal door use. If installed on solid wood garage doors, you should install with adhesive, which is sold separately (not on this website) by your local hardware store-see below. Wood garage doors tend to move and wood can expand with weather conditions. Adding adhesives will help hold nailed studs since the nails have a smooth texture vs screws.
These can be used for decorative projects such as gates, shutters, fences, and doors or interior projects. If installing on movable wood surfaces such as a solid wood door, then you should add adhesive to prevent it from working loose over time.
Adhesives: We recommend Loctite because it works and they offer a product to meet your geographical area and project.
Due to selling and shipping restrictions, we cannot sell adhesive but Loctite can be purchased at your local hardware or community lumberyard. Make sure it is for exterior use and for the materials you are attaching too.
The adhesive should be designed for the materials you're installing to an exterior or interior grade. We do offer a ring of color samples available for purchase on our site.