Cheap And Discounts M2 M2.5 M3 M4 M5 M6 Brass Heat Insert Nut Assortment Set Hot Melt Nutinsert Thread Knurled Double Twill Embedment Copper Nuts Wholesale. Buy Directly From Merchant Fire-Cat Store. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.