Keep your fasteners securely in place with this Internal Tooth Lockwasher. Made from durable steel with a zinc coating for added protection against corrosion, this lockwasher ensures reliable performance in a variety of applications. With an outside diameter of .402 inches and a thickness of .021 inches, it is designed to fit #10 hole sizes. The precise measurements of the inside diameter (.199 inches) guarantee a perfect fit for your fasteners, providing a strong grip and preventing loosening over time. Rest assured of its quality and environmental compliance with its RoHS certification. Trust in this essential component to keep your assemblies tight and secure.