Nylon Expansion Screw Plastic Self-Tapping Anchor Screw for Wall. These nylon wall plugs with self-tapping screws deliver quick, lightweight firm fixing for wall decorations with simple drilling installation and strong non-slip holding power. Ordinary screws cannot stay tight inside wall holes, while our yellow fish nylon wall plugs fill gaps tightly to grip screws firmly and avoid slipping or loosening over time. Ideal for mounting picture frames, switches and small wall fixtures, our yellow fish nylon wall plugs provide tight stable fixation with convenient installation and low cost.