Features: Crafted from high strength steel, these M6 butterfly nut with double threaded screws offer outstanding corrosion resistance and tensile strength, ensuring long service performances in demanding environment. The innovative wing shaped head enables tool without installation, while double threaded design ensures compatibility with various connectors for secure fastening in furniture, machinery, and DIY projects. Ideal for mechanics, industrial workers, and DIY enthusiasts search reliable fastener for frequent assembly/disassembly tasks requiring both durability and user friendly operation. Perfect for securing outdoor structures, automotive components, and workshop equipment where weather resistant steel fastener prevent and maintain structural integrity. Each 40 piece set provide multifunction solution for professional and home use, featuring standardized M6 sizing to simple replacements across multiple applications while reducing maintenance costs. Specifications: Material: Steel Screw length: about 3cm/1.2inch Package Includes: 40pcs Double Threaded Screws note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.