Function: 100% brand new and high quality. Made of premium iron material, these screws are sturdy and durable. The surface of the screw is zinc plated for better performance. There are many different sizes of screws for different purposes. All screws are securely packed in a plastic box for easy transport and storage. Specifications: Material: Iron Surface Finish: Zinc Plated Size(Screw Diameter * Total Length) Quantity: 6 * 2520pcs 6 * 3020pcs 6 * 3520pcs 6 * 4010pcs 6 * 5010pcs 6 * 6010pcs Weight:527g / 18.6oz Package List: 1set * Knock Screws