Ensure optimal security and stability in your assemblies with this Internal Tooth Lockwasher. Made from durable steel with a sleek black zinc finish coating, it offers reliable protection against loosening and vibrations. Measuring .402 inches in outside diameter and .021 inches in thickness, this essential component is designed for #10 hole sizes. With an inside diameter of .199 inches, it provides a snug fit for efficient fastening. Compliant with RoHS regulations, it is both high-performing and environmentally friendly, making it a must-have for any industrial or DIY project.