[680PCS M2 M2.5 M3 M5 M6 Metric Knurled Nuts Assortment Set]: This set includes 680 pieces of M2, M2.5, M3, , M5, and M6 threaded insert nuts. [Heat Set Inserts for 3D Printing]: These brass heat set inserts are perfect for securing components in 3D printed parts and can be used in a variety of materials such as ABS, PLA, nylon, and more. [Knurled Design]: The knurled design ensures a secure fit while the threaded feature allows for easy installation. [Easy Assembly]: These nuts are perfect for projects requiring a secure fit and easy assembly. [Versatile Set]: This versatile set includes a variety of sizes and is perfect for any 3D printing enthusiast or professional. Metric threaded nuts (M2x2x3.2 M2x3x3.2 M2x4x3.2 M2x6x3.2)X52PCS (M2.5x2.5x3.5 M2.5x4x3.5 M2.5x6x3.5)X52PCS (M3x4x4.2 M3x6x4.2 M3x8x4.2 M3x10x4.2)X30PCS (M4x4x6 M4x6x6 M4x8x6 M4x10x6)X30PCS (M5x6x7 M5x8x7 M5x10x7)X12PCS (M6X6X8 M6X8X8 M6X10X8 M6X12X8)X10PCS Colour:Photo Color Material:Metal Package Contents: 680 x M2 M2.5 M3 M5 M6 Metric Knurled Nuts Assortment Set 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.