Content: 140pcs Self-tapping screws for drywall and 30pcs expandable screws. Material: All screws are carbon steel, with black oxide finish, resistant to rust and corrosion, even in a wet, beautiful and practical environment. The surface of the wire screw is smooth and without burr. . Good mounting performance when installed on wood, wood on wood, ceiling and more, not easy to slide during installation. The set includes 7 sizes: M3.5 * 16 mm (20 pieces); M3.5 * 20 mm (20 pieces); M3.5 * 25 mm (20 pieces); M3.5 * 30 mm (20 pieces); M3.5 * 35 mm (20 pieces); M3.5 * 40 mm (20 pieces); M3.5 * 50 mm (20 pieces). Ideal for a wide variety of workers and workshops - plumbers to installers for professionals and amateurs. Specification: Material: Carbon steel Type: Phillips Head style: Current head Detail of the package M3.5 * 16: 3.5 * 7.5 * 16 * 1.5 mm m3.5 * 20: 3.5 * 7.5 * 20 * 1.5 mm M3.5 * 25: 3.5 * 7.5 * 25 * 1.5 mm m3.5 * 30: 3.5 * 7.5 * 30 * 1.5 mm m3.5 * 35: 3.5 * 7.5 * 35 * 1.5 mm M3.5 * 40: 3.5 * 7.5 * 40 * 1.5 mm m3.5 * 50: 3.5 * 7.5 * 50 * 1.5 mm Total: 140pcs Wood Screw +30 Plastic Ankle