Secure your projects with precision using the Napa Balkamp 725-1135 Presto Pin R Clip Hitch Pin set. Each pack contains 5 units, boasting a durable zinc-plated finish that protects against corrosion. These 4-inch length hairpin and straight cotter pins are made of robust steel, ensuring reliability for your fastening needs. Designed for versatility, these pins are compatible with inch-based measurement systems and are proudly manufactured in the United States. The 5/16 diameter pins are ideal for a variety of applications, providing a secure hold with every use. Please be aware of the California Prop 65 warning that accompanies this product.