Hardened Headless Steel Brads (Sprigs). Used on hardwood floor installations. Brads have a sharp needle point and can be sunk out of sight into the material. Great for hollow and loose spots. When gluing wood flooring, they hold material in place until the adhesive sets. They are the deal for wood reducers and end caps. You can throw that plastic hold down strip in the trash. Always wear proper eye protection when using these brads. They can shatter into shrapnel if you hit them wrong.