- Pack of 100 ruthex RX-M3x5.7 M3 brass threaded inserts, designed for 3D printers and plastic parts - Easy to install using heat or ultrasound, ideal for embedding in thermoplastics such as PLA, PETG, ABS, PPS, and PP - Threaded sleeve geometry ensures a firm and stable hold in the part - Opposing spiral knurled nuts for high tightening and release torque - Made of high-quality brass, they offer corrosion resistance and excellent thermal conductivity - Allow for reuse and easy removal without damaging the part - Compatible with popular 3D printers and DIY projects - Professional solution for durable fastenings in 3D printed parts