300 pezzi inserti M2-M6 ottone zigrinato dado filettato set termico per stampa 3D plastica
300pcs Threaded Insert M2 M2.5 M3 M4 M5 M6 Insert Nut Brass Threaded Bushings Internal Thread Knurled Nuts with Plastic Box for Plastic Parts by Heat or Ultrasonic for 3D Printer Parts. 300PCS Threaded Inserts.