Enhance the security and stability of your fastening applications with this Internal Tooth Lockwasher. Crafted from durable steel with a protective zinc coating, it offers reliable performance and corrosion resistance. With an outside diameter of 20.5mm and a thickness of 1mm, it is designed for precision fit. Featuring an inside diameter of 13mm and a hole size of M12, it ensures a snug and secure grip. Compliant with RoHS regulations, it is environmentally friendly. Upgrade your assembly process with this essential component that guarantees peace of mind.