describe 【High-quality material】The metal washer with inner teeth is made of carbon steel. manganese 65. It is sturdy and durable, not deformed, wear-resistant and corrosion-resistant. Durable for a long time. Apply a spring force between the head and the substrate. Self-locking washers are an ideal choice for quick correction and maintenance. It can apply a spring force between the mounting head and the substrate, making the joint hard against the substrate. For older Friction and rotation resistance. 【 Various sizes 】 7 sizes of the most common lock washers. There are M3/M4/M5/M6/M8/M10/M12 star locks. You can choose different sizes according to your needs. Widely used in many fields, such as machinery and equipment, lawn mowers, engines, cars, trucks, trailers, toys, bicycles, RVs, boats, pumps, furniture, etc. The fastener combination set includes 340 black brake pads with plastic boxes. Each size is separately separated in the storage box for easy selection and storage. 7 sizes of clamping washers meet your different needs. Black color Quantity per package: 340 washers < p> With the concept of customer first, we provide you with 24/7 customer service. No matter where you are or what problems you encounter, we will solve them for you as soon as possible to ensure your shopping experience is worry-free.