Suitable for 3D printing: Brass threaded inserts can be embedded into plastic materials using heat from a soldering iron or ultrasound, providing an optimal solution for adding threads in 3D printing. Common specifications: This set includes a combination of M3 and M5 inserts, based on the most commonly used sizes by 3D printing enthusiasts. Lengths range from 3mm to 12mm. Secure fixation: Made of high-quality brass with precision processing, these inserts offer excellent heat conduction and corrosion resistance. Knurled threaded inserts provide stronger grip strength compared to straight-threaded versions and can withstand high tensile forces. Clear labeling: Each specification is stored in a separate compartment within the plastic box, with labeled compartments showing key data for easy identification. Note: Slight color variations may occur due to lighting or display differences, but this does not affect product functionality. Plastic box design may vary and is subject to availability. Color: Gold Material: Brass Package Contents: 420 x Threaded Inserts (Only the above package content; other products are not included) Note: Due to lighting and monitor settings, the item color may vary slightly from the images. Measurement error allowance is +/- 1-3 cm.