Product specification: Model: MXBN6;  Product: Knurled brass threaded insert nut assortment kit;  Nut type: Knurled nut;  Material: Brass;  Color: Brass Tone;  Inner diameter: 2mm, 3mm, 4mm and 5mm;  Outer diameter: 3.5mm, 5mm, 6mm and 7mm;  Hight: 4mm, 6mm, 8mm, 10mm;  Application: Heat resistant, great for 3d printing;     Product Feature:  Premium brass material, heat resistant, wear-resistant, acid-resistant rust-proof, anti-corrosive and non-toxic, high hardness for long time use.  No need to counterbore or countersink the boss hole since the insert has guide pilot.  Can be installed by ultrasonic or heat into thread tapered hole, or molded in during injection.     Package include:  M2 x 4mm x 3.5mm  40pcs;  M2 x 6mm x 3.5mm  40pcs;  M2 x 8mm x 3.5mm  40pcs;  M2 x 10mm x 3.5mm 40pcs;  M3 x 4mm x 5mm 30pcs;  M3 x 6mm x 5mm 30pcs;  M3 x 8mm x 5mm  25pcs;  M3 x 10mm x 5mm 25pcs;  M4 x 4mm x 6mm 20pcs;  M4 x 6mm x 6mm 20pcs;  M4 x 8mm x 6mm 15pcs;  M4 x 10mm x 6mm 15pcs;  M5 x 6mm x 7mm 10pcs;  M5 x 8mm x 7mm 10pcs;  M5 x 10mm x 7mm  10pcs;  Total Quantity: 370Pcs.