380PCS Kit Threaded Inserts 380Pcs Set includes M2x3x3.2-60Pcs M2.5x4x4-100Pcs M3x4x4.2-100Pcs M4x4x5-50Pcs M5x5x7-40Pcs M6x6x8-10Pcs 1/4-20x68-10Pcs M8x8x10-10Pcs Insert Tips include M2 M2.5 M3 M4 M5 M6 (1/4) M8 Insert Tips are suitable for SP40NUS/Hakko FX-888D/900M and T18 Iron Both Insert Tips and Brass Nuts are made of high-quality brass with standardized size processing used for hot insertion nuts in 3D printing and other plastic parts.