Package Included: You will receive a box of 240PCS threaded knurled brass nuts, including three sizes: M5 , M4 , M3, which can well meet your daily needs. Premium material: Our M3 M4 M5 threaded inserts are made of the highest quality brass, which ensures good corrosion resistance and thermal conductivity, with the advantages of heat resistance, oxidation resistance, hardness and durability, perfect for long-term use. Very practical: Screw-in design ensures fast and stable insertion. Good positioning without damaging the plastic. The opposite spiral knurled nut ensures a balanced high tightening and loosening torque and high pull-out force. This guidance makes insertion much easier for the user. Easy to store: All threaded knurled brass nuts are stored in a clear plastic box for easy use and protection, the threaded inserts are not messy and you can easily find the specifications you need. Very versatile: The threaded nuts are designed for thermoplastics, such as PLA, PETG, ABS, PPS,