Features 1、Ideal Match for Your 3D Printed Components: Ideal Match for Your 3D Printed Components: They offer a dependable and secure method for attaching components in 3D printing projects, enhancing the strength and functionality of your creations with ease. 2、Stable Grip with Easy Application: The reverse spiral-shaped knurled nuts deliver a balanced high tightening torque, ensuring a steady connection. Our heat set inserts provide smooth installation onto plastic components, resisting torque and preventing pull-out.  3、Robust and Resistant to Corrosion: Made from top-quality copper, our threaded inserts offer excellent corrosion resistance and thermal conductivity. Their outstanding durability and high resistance to breakage or deformation make them a trustworthy choice for various applications.  4、Broad Compatibility with Plastics: Engineered for all thermoplastics, including PLA, PETG, ABS, PPS, PP, and more, these inserts are suitable for use in 3D printers, electrical molding machines, automotive plastic shells, and laptop molds. Their versatility ensures compatibility with a wide variety of materials.  5、Useful Thread Insert Assortment Kit: This kit includes 345 insert nuts in sizes M2, M2.5, M3, M4, M5, and M6 internal threads, and 7pcs heat-set Insert tips. It is conveniently packaged in a plastic case for easy storage, adding to its practicality as a 3D printing accessory. Specification Material: Copper Insert Nut Quantity: 345PCS Heat-Set Insert Tips Quantity: 7PCS Package List 345 x Insert Nut 7 x Heat-Set Insert Tips