Various Sizes: you receive 1000 pcs of brass threaded inserts for plastic in 15 sizes, including 80 pcs M2 x 4 x 3.5, 80 pcs M2 x 6 x 3.5, 80 pcs M2 x 8 x 3.5, 80 pcs M2 x 10 x 3.5, 80 pcs M3 x 4 x 5, 80 pcs M3 x 6 x 5, 80 pcs M3 x 8 x 5, 80 pcs M3 x 10 x 5, 60 pcs 4MM x 4 x 6, 60 pcs 4MM x 6 x 6, 60 pcs 4MM x 8 x 6, 60 pcs 4MM x 10 x 6, 40 pcs M5 x 6 x 7, 40 pcs M5 x 8 x 7, 40 pcs M5 x 10 x 7, can meet your needs Quality Brass Material: our M2 M3 4MM M5 knurled brass heat set insert tool is produced from quality brass, hard, and resisted, which not only ensures the and robustness of the inserts but also provides good thermal conductivity, can last for a long time User Friendly Installation Method: ease of use is a priority when it comes to our M2 M3 4MM M5 brass thread inserts for metal; They can be effortlessly installed into the part of the 3D printer by heating or using ultrasonic, which saves you time and effort, ensuring an easy and efficient setup process Innovative Features: our brass threaded inserts for metal feature a tapered shape at the bottom, making them easily fit into the exact position before inserting; Additionally, the neat and organized packaging keeps them sorted by size, ensuring you can find the right insert without or confusion Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:gold Material:brass Package Contents: 1000 x Threaded Inserts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.