Features Durable Manganese Steel Construction - Crafted from high-quality manganese steel, these washers ensure long-lasting performance and reliability for demanding applications Versatile Application Range - Suitable for installation on various materials, this kit is perfect for both DIY projects and professional use, making it a must-have for your toolbox Comprehensive Size Selection - The kit includes 7 popular sizes: M3, M4, M5, M6, M8, M10, and M12, ensuring you have the right fit for any task at hand Convenient Storage Solution - All washers are organized in a sturdy, transparent plastic box, allowing for easy access and transport, keeping your workspace tidy and efficient Effortless Installation Process - Designed for quick and easy installation, this internal lock washer kit simplifies your fastening tasks, enhancing productivity in any project Features: 1、Made of manganese steel material, and practical to use. 2、Wide range of applications, can be installed on many different types of materials. 3、The kit includes 7 of the most common sizes: M3 M4 M5 M6 M8 M10 M12. 4、All gaskets are packed in a sturdy transparent plastic box for storage, easy to carry and easy to use. 5、 internal tooth lock washer kit, easy to install, great for professional use. Specification: Condition: 100% Item Type: Tooth Lock Washers Material: Manganese steel Quantity: 280pcs Size: M3 M4 M5 M6 M8 M10 M12 Package List: 40pcs x M3 40pcs x M4 40pcs x M5 50pcs x M6 50pcs x M8 40pcs x M10 20pcs x M12 Package List 40pcs x M3 40pcs x M4 40pcs x M5 50pcs x M6 50pcs x M8 40pcs x M10 20pcs x M12