SAE Metric Nylon Locknut Kit ? 348-Piece Assortment of Stainless Steel Nylock Nuts Versatile SAE Metric Assortment: This 2-in-1 kit features 348 high-quality nylon insert lock nuts?137 SAE pieces and 211 metric pieces?providing a range of sizes for any project. The SAE selection includes 8 sizes, from #6-32 to 1/2"-13, while the metric set offers 7 sizes, from M3 to M12. Whether for DIY or construction, this kit has you covered. 304 Stainless Steel for Durability: Made from 304 stainless steel (18-8), these locknuts are built to last. They offer excellent corrosion resistance and durability, outperforming galvanized options for a longer service life, especially in demanding environments. Nylon Insert for Secure Fastening: Designed with nylon inserts, these lock nuts form a tight fit with bolt threads, reducing the risk of loosening due to vibration. They also provide abrasion and shear resistance, allowing for secure and repeated use. This kit is an essential choice for any professional or DIY enthusiast seeking reliable, high-strength lock nuts for various applications.