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【High-Quality Material】: These drywall screws are made from premium galvanized carbon steel, offering high strength, corrosion resistance, and long-lasting use. 【Complete Set】: You will receive 50 drywall anchors. Size: M4*38mm. 【Easy Installation】: These drywall expansion bolts are simple to use. Just drill a hole at the desired location, insert the expansion screw into the hole, and tighten the bolt at the top for a secure and stable fix. 【Auto-Expansion Feature】: The hollow structure of these drywall screws allows them to automatically expand when fixed, ensuring a strong hold. 【Wide Application】: These drywall screws are suitable for various uses, including drywall, concrete walls, hollow walls, thin metal, fences, security doors and windows, and other wall installations and decorations.