Durable AISI316 Stainless Steel Butterfly Wing Nut for Heavy-Duty Projects. Premium Material Grade: Made from durable AISI316 Stainless Steel (Grade A2/A4) for heavy-duty applications. Customizable Specifications: Available in sizes M5 to M20 with customizable packaging and surface finish options. Multi-Standard Compliance: Meets international standards including DIN, ANSI, GB, and GOST for global compatibility. Hinged Butterfly Design: Features a butterfly wing head style with hinged bolts for secure and easy connection. Manufacturer Direct Supply: Direct from Qingdao Dewell Metals with own factories and 20+ years of market presence. Flexible Packaging Options: Standard carton packing available, with custom packaging solutions to meet specific requirements.