Enhance fastening security with our Internal Tooth Lockwasher. Crafted from durable steel with a sleek black oxide finish, this 7mm outside diameter washer ensures reliable performance. At just .5mm thick, it fits snugly in assemblies without adding bulk. Designed for metric systems, it features an inside diameter of 3.7mm and a hole size of M3.5 for seamless integration. Rest easy knowing it complies with RoHS standards, making it a responsible choice for your projects. Elevate your fastening solutions with this essential component.