200/500Pcs M2*L-3.5 M2.5*L-3.5 M3*L-4.2(OD) Injection Nut Copper Insert Knurled Nuts Knurling Kit For Electrical WholesaleBuy Directly From Shop2960108 Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.