Ronstan RF318 Stand-up spring 21mm

The Ronstan RF318 Stand-up Spring is a durable and reliable component designed specifically for use with Series 15 and 20 Utility blocks featuring the saddle RF498. This 21mm stand-up spring ensures optimal performance by providing consistent tension and support, making it an essential part of your rigging system. Crafted from high-quality materials, it offers excellent resistance to corrosion and wear, ensuring longevity even in harsh marine environments. The RF318 is easy to install and maintain, making it a practical choice for both amateur and professional sailors looking to enhance their boat's functionality.