Each 40 piece set provide multifunction solution for professional and home use, featuring standardized 6mm sizing to simple replacements across multiple applications while reducing maintenance costs Perfect for securing outdoor structures, automotive components, and workshop equipment where weather resistant steel fastener and maintain structural integrity Ideal for mechanics, industrial workers, and enthusiasts search stable fastener for frequent assembly / disassembly tasks requiring both durability and user friendly operate 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 projects Crafted from high strength steel, these 6mm butterfly nut with double threaded screws outstanding erosion resistance and tensile strength, ensuring long service in demanding environment, Manufacturer: YanFengPro