These Tolsen drywall screws are designed for securing gypsum boards to wooden or metal frames. This specific variant features a length of 25mm, a black finish, and a trumpet head that sinks smoothly into the material, while the Phillips cross drive ensures a reliable grip during installation. Coming in a pack of 500 pieces, these 3.5x25mm screws provide the appropriate length based on the thickness of the drywall and the depth of the supporting structure for your project needs.