Features Firmly Fixed Expansion Tube: Each screw includes an expansion tube to ensure items remain securely attached, preventing any unwanted loosening or falling off during use Durable Nylon Plastic Construction: The high-quality nylon plastic of the expansion tube offers excellent toughness, resisting brittleness and damage for long-term reliability Strong Carbon Steel Screws: Crafted from premium carbon steel, these screws provide superior strength and hardness, ensuring they maintain their shape and integrity over time Convenient Storage Box Included: A lightweight, compartmentalized storage box keeps your screws organized and easy to transport, making your projects more efficient and hassle-free Versatile Usage Options: Ideal for a variety of applications, these screws are perfect for installing curtains, lighting fixtures, bookshelves, and more, catering to all your fastening needs Features: 1、[FIRMLY FIXED] This screw also comes with an expansion tube, which can hold items more stably without worrying about it falling off or loosening. 2、[NYLON PLASTIC] The nylon plastic of the expansion tube has good toughness and will not become brittle, fractured or damaged, ensuring long term stability. 3、[CARBON STEEL] The screws made of carbon steel are very strong, with good hardness, no , and no deformation after long term use. 4、[STORAGE BOX] We have provided a compartmentalized storage box for these screws, which can be closed easily, light weight and easy to carry. 5、[WIDE APPLICATION] You can use these screws to install curtains, lighting fixtures or accessories, bookshelves, wall or bookshelf mounts, audio equipment, walkie talkies, wall clocks. Specification: Item Type: Self Tapping Screw Set Material: Carbon steel, nylon plastic Package List: 40 x M5X25 Screw 30 x M8X40 Screw 40 x M6X30 Screw 20 x M8X60 Screw 30 x M6X30 Screw 30 x M6X40 Screw 20 x M8X40 Screw 1 x Storage Box Package List 40 x M5X25 Screw 30 x M8X40 Screw 40 x M6X30 Screw 20 x M8X60 Screw 30 x M6X30 Screw 30 x M6X40 Screw 20 x M8X40 Screw 1 x Storage Box