Features: -340Pcs Star Lock Washers With 100Mm Diameter Internal Teeth In 7 Sizes, M3 M4 M5 M6 M8 M10 M12, Meet Your Your Different Needs. -Manufactured Made Of High Quality Steel Made Of 65Manganese Metal, Anti-Corrosion And Durable. -Provides Spring Force, Sturdy Grip, Creates More Friction And Resistance To Friction. The Rotation. -Used In Machinery, Furniture, Electrical Appliances, Electronic Equipment, Cars And Industrial Production Of Shock Absorption And Insulation. -All Lock Washers Are Stored In A Clear Plastic Sorting Box With Data Sheet, Easy Identification And Storage. Specifications: Washer Type: Star Washer Material: 65Manganese Steel Color: Black Sizes: M3 M4 M5 M6 M8 M10 M12 Weight: 200G Quantity: 340 Pcs Package Included: M3 X 60 Pcs M4 X 60Pcs M5 X 60Pcs M6 X 50Pcs M8 X 50Pcs M10 X 40Pcs M12 X 20Pcs Warm Tip: 1)Keep Small Items Out Of Reach Children. 2)Shocks During Transportation May Confuse Small Items.