Complete specifications: Insert Brass Nuts Set includes 345 insert nuts with sizes of M2, M2.5, M3, M4, M5, and M6 internal threads. It can adapt to a variety of workpiecesFunction: Our Hot Melt Knurled Threads can be used to modify your 3D printer parts, providing a reliable method for fastening parts in 3D Printings projectsStable connection: Heat Embedment Copper Nutss opposite spiral knurled nuts provide a balanced high tightening torques, ensuring a stable connection. The heat-set insert can be seamlessly installed on PP parts, resist torques, and stop pull out.High performance: Insert Embedment Nuts are made of brass, have good thermal conductivity, are resistant to breakage, are not easy to deform, and can be used for a long time.Applicable: Insert Brass Nuts Set is suitable for thermoplastics, including PLA, PETG, , PP, etc., and can be applied to 3D printers, electric molding machines, automotive PP shell, and laptop computer molds. Specification: Material: Brass Size Chart: Packing size: 25cmx15cmx2cm/9.84inchx5.91inchx0.79inch Package Includes: 30 M2xD3xL2.530 M2xD3xL330 M2xD3xL430 M2.5D3.5xL430 M2.5xD3.5xL530 M3xD5xL330 M3xD5xL430 M3D5xL525 M4xD6xL425 M4xD6xL625 M4xD6xL810 M5xD7xL710 M5xD7xL95 M6xD9xL85 M6xD9xL9 Note: Please allow slightly errors due to manual measurement and different monitors.