300Pcs Hot Melt Heat Nut Thread Knurled Brass Set Insert Embedded Nuts Kit M2-M6
300pcs Threaded Insert M2 M2.5 M3 M4 M5 M6 1/4-20 Insert Nut Brass Threaded Bushings Internal Thread Knurled Nuts with Plastic Box for Plastic Parts by Heat or Ultrasonic for 3D Printer Parts. Total 300pcs / box.