Durable material: rivet nuts made of aluminum alloy, with good resistance to corrosion, water and rust, and can be used for a long time. Different sizes: We have four sizes of M4, M5, M6, M8, so you have different choices in different situations and different needs. Precision design: The blind rivet nut has a precise thread design inside, so it is very compatible with the screw, the fixing effect is better, it is not easy to fall off, and the effect assembly of the article is more stable. Easy to install: Round thread rivets have a knurled shape that increases friction with the mating surface compared to regular nuts, and they can be easily installed in many different materials. Widely Used: Rivet nuts can be used in a variety of materials such as steel, plastic, fiberglass and wood. They can also be widely used in automobiles, furniture, handicrafts and other industrial products. 1. The rivet nut has excellent corrosion resistance and toughness, is not easy to deform, and can be used for a long time. 2.There are 25 nuts for each of four types, which can meet your quantity and type requirements. 3. Crimp nuts are important embedded parts that can be used in automobiles, furniture, decorations, handicrafts and other electrical and industrial products. Technical data: Material: alloy Color: silver size: M4: 119mm, M5: 1310mm, M6: 1512mm, M8: 1815mm Package contains: 100 crimp nut Note: 1.Please allow some difference due to manual measurement.