[Multiple Standard Sizes]: In this kit, you get 350pcs M2 M2.5 M3 M5 M6 female knurled nuts in different lengths, total 18 sizes. Super large quantity and various sizes can meet your needs to install numerous 3D printing accessories. [Thickened Storage Case]: This threaded inserts assortment kit comes with a reinforced case, with thickened dividers and latches, keeping all brass nuts well organized, clear labels pasted on the inner and outer lids, easy to store and at hand when [Firm Hold & Easy to Use]: The brass threaded insert can be installed into the part of the 3d printer by heating or ultrasonic. Due to the geometry of the threaded sleeve, it holds firmly in the pressure part. The opposing spiral knurled nut ensures a high balance of tightening and loosening torque. Through the guide, insertion has been greatly simplified. [High Quality Threaded Inserts Assortment]: Knurled nuts with internal threads are made of high quality brass, which has the optimal thermal conductivity and resistance, ensuring that each nut inserts last for a long time. [Wide Applications]: These heat set insert are suitable for various plastics and can be inserted in tapered holes by heating or ultrasonic, as well as by injection molding., Weight: 0.46737999544 pounds, Manufacturer: Tuidzljd