DescriptionOur knurled nuts are made of premium brass material, durable and sturdy for long time use, professional technology makes the nuts with high thermal conductivity, high hardness, and good corrosion resistance, widely applicable for 3D printing, circuit board, micro motor, computer, and so on.Features- Brand: iplusmile. - Color: As shown. - Material: Brass. - M2 size: 3.5X4mm/0.13X0.15in (40pcs). - M3 size: 5X4mm/0.19X0.15in (60pcs). - M4 size: 6X5mm/0.23X0.19in (30pcs). - M5 size: 7X6mm/0.27X0.23in (20pcs). - M6 size: 8X6mm/0.3X0.23in (20pcs). - Our nuts are made of brass materials, durable and sturdy for long lasting use, professional treatment gives the nuts high heat resistance and corrosion resistance. - Reasonable design has crafted accurate screw teeth, outside knurled surface with strong grip force, not easy to loose when tightening.- Stable and reliable, high thermal conductivity, good heat resistance. Easy to operate, can be installed into the threaded hole by heating or ultrasonic. - A pack includes different sizes including M2, M3, M4, M5, M6, which can meet your various needs, with a storage box for easy organizing, no more messy situations. - Our knurled nuts are widely suitable for many purposes, such as circuit board, micro motor, computer, 3D printing, electronic parts installing, and so on.