Package content: You will receive 300pcs M2 M3 M4 M5 M6 threaded knurled nuts((M2x2.5x3.2 M2x3x3.2 M2x4x3.2)X30 pcs, (M2.5x4x3.5 M2.5x4x3.5 )X30 pcs, (M3x4x5 M3x5x5 M3x56x5)X30 pcs, (M4x4x6 M4x6x6 M4x8x6 )X10 pcs, (M5x6x7 M5x10x7) X10 (M6X8) X5 (1/4-40X12.7X8) X5), equipped with durable plastic, individually packed in compartments to prevent mixing, more convenient to use. Multiple Sizes: There are 15 sizes to meet your different needs. With these M2 M3 M4 M5 M6 thread knurled nuts, you can choose more convenient. High Quality Material: These threaded inserts are made of high quality brass, which is strong and durable. Reliable materials and exquisite workmanship ensure its performance and service, so you can use it with confidence. Installation: These brass knurled thread insert nuts can be installed ultrasonically or thermally, or during the molding process. Brass is heat-resistant and has better hardness and toughness than aluminum, so it is more suitable for 3D printing molding. With special thread design, it is easy to operate. Versatile Applications: These threaded inserts are perfect for molding, fastening, or other projects. Back drilling and countersinking are not required. Colour:yellow Material:brass Package Contents: 300 x Thread Knurled Nuts Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.