1.Affordable Packaging: Size: M3 M4 M5 M6 M8 M10 M12. 200 Serrated Flange Lock Nuts are packaged in a convenient clear plastic storage box. Convenient storage and sorting, easy to carry.2.High quality material: A2-70 stainless steel nut, standard type: German standard. No peculiar smell, non-toxic, corrosion-resistant, wear-resistant, non-rust, non-broken, durable, keep you in the outdoor area.3.Professional Quality Flange Nuts Hexagon nuts with flanges and locking teeth conforming to DIN 6923/ISO 4161, also known as ring nuts or ring nuts, are an improved form of hexagon nuts. Hex nuts with flanges provide a large contact surface for optimal force distribution.4. Main Features: Serrated flange ensures locking. The serrations help prevent nut vibration and increase nut holding force. The presence of the flange eliminates the need for gaskets. The serrations prevent the nut from loosening from the screw under the dynamic load of the connection.5. Application field: Can be used with all standard screws (metric standard thread) such as hexagon screws, cylindrical screws, countersunk screws, pan head screws, etc.