Features: Made from zinc alloy material, it has good strength and corrosion resistance. Flat wafer head ensures a strong connection and resistance to head breakage, fine thread gives great performances and high pull-out resistance. Sharply point for easy penetration. Used when constructing Drywalls track, plasterboard, metal sheets, wood. Zinc Alloy screws perfect for constructions, plasterboard, plaster wall, wood panel, stair and other indoor applications, patios and various wood joints. Stored in a durable and sturdy plastic box, packaged well. 8 kinds of commonly used screw lengths to meet your different needs. Specifications: Material: Zinc Alloy Color: Colorful/Black Size: As Shown In The Picture Package Includes: 50PCS M3x6 50PCS M3x8 50PCS M3x10 50PCS M3x12 50PCS M3x16 50PCS M3x20 50PCS M3x25 50PCS M3x30 20pcs Plastic Anchors note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.