340 pieces in 7 sizes: 340 pieces Internal Tooth Star Lock Washer in 7 sizes: M3 x 9mm, M4 x 12mm, M5 x 12mm, M6 x 14mm, M8 x 18mm, M10 x 20 mm, M12 x 25 mm, enough to meet your usual needs.<br> Sturdy and durable: high quality 65 manganese steel washers, black oxide coating prevents oxidation and aging, offers good corrosion resistance and high temperature performance.<br> Excellent locking function: the lock washer exerts a spring force between the fasteners head and the substrate, creating more friction and resistance to rotation, ideal for quick repairs and carrying out repair.<br> Wide application: widely used in machinery, furniture, electrical appliances, electronic equipment, cars, sports equipment and production industrial shock absorption and insulation.<br> Portable tools: All star washers are stored in a transparent plastic sorting box with a specification sheet, you can quickly find what you need need, easy identification and storage.<br>Note: <br>1. Please allow 1-3 mm error due to manual measurement and 1-3g weight error make sure you don't mind before ordering. <br>2. Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please make sure you don't mind before ordering, thank you!<br>About Shipping: <br>1.please pay attention to your delivery address such as: name, street, house number, doorbell/email without name, etc. is correct, or the order will not be delivered correctly.<br>2.All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.<br>3.During the shopping process, if you have any questions, please feel free to consult us, we will reply you within 580 hours, wish you a happy shopping!