For DIYers, mechanics, or anyone working with assemblies, these M8-1.25 serrated flange lock nuts are super handy. Made from 304 stainless steel (18-8 grade), they're rust-resistant and durable, so they'll hold up in various environments. The flange design provides a wider bearing surface, which is great for thin materials or oversized holes, helping to distribute load and prevent loosening. The nylon insert inside creates a solid locking action once tightened, keeping vibrations from shaking things loose. They have a bright finish and come in a pack of 10, so you've got plenty for multiple projects. Honestly, if you need reliable, reusable lock nuts for automotive, machinery, or structural applications, these are a quality choice. Just make sure the mating bolt extends at least one thread past the nut for proper locking engagement.