【Compact Storage】: The four-compartment case is compact and lightweight, making it easy to store and carry. Double knurled for a superior grip when compared to standard inserts for injection molding. Internal threads are M3x0.5mm. Insert has a diameter of 5mm, and a... Our package includes a total of 300 threaded inserts Uxcell 300pcs M2 M2.5 M3 M4 M5 Metric Threaded Inserts Brass Heat Set Insert Knurled Nuts Assortment Kit 3d Printing Brass Nuts Female Threaded Inser Uxcell 300pcs M2 M3 M4 M5 M6 Metric Threaded Inserts Brass Heat Set Insert Knurled Nuts Assortment Kit 3d Printing Brass Nuts Female Threaded Inserts 375ad966 Bcda 4794 B683 Bf4bcae58e15.3d0e9a032162ee0aa5396bc49f8066b5 Whether you're working on DIY projects, prototyping, or professional applications, our inserts will provide secure and reliable fastening solutions. 4 Heat Set Inserts at Christopher Laskey blog 【Easy to Use】: Our set comes with 3 additional soldering iron tips in sizes M2., 5, M3, and M4, allowing you to conveniently embed the inserts into your 3D printed parts. The sturdy construction ensures their reliability and longevity, making them suitable for various applications.