High-quality brass and corrosion-resistant: The nut is made of high-quality brass. High-quality brass makes the nut have the characteristics of corrosion resistance, heat resistance, and oxidation resistance. It is sturdy and durable, even if it is in a humid environment for a long time, it will not rust or loosen. Screw design and easy insertion: The screw cap is designed with a screw that is very easy to use, and the positioning effect is good, can ensure that the screw cap is inserted into the hot-melt plastic without damaging the plastic, providing you with much convenience. Standard M3 deep thread: The thread of the nut is a standard deep thread, and the outer side of the nut also has a unique knurling pattern, which can effectively prevent fingers from slipping when tightening. The hole of this nut also has a very high clamping force after cooling. Makes the fixed object stable and not easy to deform. [Smooth Polishing and Good Thermal Conductivity]: Each nut is carefully polished without burrs on the surface. Copper has good thermal conductivity, so the copper nut not only heats up quickly and speeds up work efficiency, but also conducts heat to the plastic part, makes the plastic holes softer so that it is easier to press into the holes. Suitable for Most 3D Printer Parts: When using, you just need to insert it into the hole, heat the threaded insert with a soldering iron. After heating, press the threaded insert. Then, cool and tighten the screws. The press-in nuts can easily be inserted by ultrasound or heat (soldering iron). This threaded nut is not only very suitable for PLA, PETG, ABS, PPS, PP and other thermoplastics, but also suitable for most 3D printer parts. Features: 1. The workmanship of each nut of this product is very fine, so this nut has a small tolerance and high precision. 2. The unique knurled outer pattern can not only play a certain decorative role when fixing objects, but also increase the friction force, which is convenient for tightening the nut without slipping. 3. This set of nuts contains 50 hot-melt copper nuts, which is enough to meet the needs of daily life. Widely used in construction, new energy, petrochemical, shipbuilding, communications, light industry and many other fields. This hot-melt copper nut is cylindrical with an eight-point pattern, it is very simple and beautiful. Features: Material: Brass. Dimensions: M3 x 5.7 x 46 mm. Color: Golden. Package Quantity: 50 pieces