Features 1、Total of 320pcs locking washers, including 7 sizes: M3, M4, M5, M6, M8, M10, M12, which can meet different needs. 2、Exerts a spring force between the fasteners head and the substrate to create more friction and resistance to rotation. 3、Suitable for machinery equipment, industrial production of shock absorption and insulation. 4、Made of premium quality manganese steel, rustproof, corrosion‑resistant and durable. 5、Manufactured to meet standard specification, strictly follow factory quality control. Specification Item Type: Push-On Locking Washer Material: Manganese Steel Surface Treatment: Black Oxide Application: Used for car shock absorption and insulation Specification: M8 50pcs M12 30pcs M6 50pcs M10 40pcs M4 50pcs M3 50pcs M5 50pcs Package List 320 x Locking Washers