50/100pcs M1.6 M2 M2.5 M3 M4 Solid Brass Copper Embed Insert Nut for Hot Melt Heat Injection Molding Double Twill Knurled Thread

50/100pcs M1.6 M2 M2.5 M3 M4 Solid Brass Copper Embed Insert Nut for Hot Melt Heat Injection Molding Double Twill Knurled Thread

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