• M2 thread inserts designed for 3D printing parts using heat or ultrasound. • Compatible with various thermoplastic plastics such as PLA, PETG, ABS, PPS, and PP. • Made of high-quality brass that guarantees corrosion resistance and thermal conductivity. • Spiral knurled nut geometry providing high tightening torque and firm hold. • The set includes 70 pieces with M2 internal thread and a length of 4 mm.