Enhance the security of your fastening applications with this Internal Tooth Lockwasher. Crafted from durable steel with a sleek black zinc finish, this washer ensures reliable performance and corrosion resistance. Its metric measurements feature an outside diameter of 8mm and a thickness of 0.5mm, perfect for M4 hole sizes. With an inside diameter of 4.3mm, it offers a snug fit for your components. Rest assured of its quality as it complies with RoHS regulations, making it a safe and environmentally friendly choice for your projects. Upgrade your fastening solutions with this essential component.