Durable material: The crimp nut is made of aluminum alloy, which has good corrosion resistance, good sealing and rust resistance, and can be used for a long time. p> Different sizes: we have 25 pieces of each of four sizes: M4, M5, M6 and M8, so you have different choices for different situations and needs. Precision design: there has a precise thread design inside the blind rivet nut, so that it cooperates very well with the screws, has better fixing effect, is not easy to fall off and the effect of assembly of the item is more stable. Easy to install: Round thread rivets have a knurled shape, which increases the friction with the contact surface compared with ordinary nuts, and can be easily installed in many different materials. Wide range of applications: Blind rivet nuts can be used in a variety of materials such as steel, plastic, fiberglass and wood. It can also be widely used in industrial products such as automobiles, furniture and crafts. Note: The data are all manually measured, please allow 1-3cm error due to Light and display differences, there may be color differences, please refer to the actual item received.