Material: AluminiumDiameter: M3, M4, M5, M6Length: 5-30mmFeatures: The product is made of aluminum, which is pressure-resistant, heat-resistant, corrosion-resistant, challenging to deformation, and has the traits of firm riveting and delightful appearance.You can discover more products in several material, type, coloration , sizes and shapes in our shop! If you have special needs, please touch us, we can customise per your needs!Package includes: 10/20/30/50 pieces * According for your choiceNotes:1.The colour of the image is barely assorted from the real object due to camera and light-weight effect, please take the particular object because the standard.2.There is probably 0-0.3mm error for its thickness, 0-3mm error for its diameter / width / length in the guide measurement, please take it into consideration, thank you!