The Metro Moulded Parts WN 4, widely recognized as an expansion rubber well nut, is crafted to provide secure stability and long-lasting performance with its robust Neoprene construction and a captive brass nut. Available in a thread size of 10-32, this well nut requires a 3/8-inch diameter hole and measures an overall length of 0.665 inches, making it essential for various applications. Known interchangeably as a Neoprene fastener or rubber rivet, it expands effectively when tightened, ensuring a firm, reliable fit. Designed with ozone and chemical resistance, the WN 4 delivers unparalleled durability in harsh environments. Its unique expansion feature allows seamless installation simply insert into the designated hole and tighten to engage the secure hold. This straightforward process provides peace of mind and ensures a lasting attachment, perfect for use across different makes and models. Choose the WN 4 for its standout style, unmatched functionality, and enduring quality. Empower your projects with one of the industry s best guarantees: Metro's leading 30-year platinum warranty promises a no-hassle replacement, demonstrating supreme confidence in your purchase. Don't hesitate enhance your applications with a part you can trust today!