200pcs/box 500pcs/box M2*L-3.5 M2.5*L-3.5 M3*L-4.2(OD) Injection Nut Copper Insert Knurled Nuts Knurling Kit For Electrical

200pcs/box 500pcs/box M2*L-3.5 M2.5*L-3.5 M3*L-4.2(OD) Injection Nut Copper Insert Knurled Nuts Knurling Kit For Electrical