Usage Tips:Suitable f 3D printing: Brass threaded inserts, which can be embedded into plastic materials using the heat from a soldering iron ultrasound, are the optimal solution f adding threads in 3D printing. Common : We have created this set of inserts using a large quantity of M3 inserts combined with M5 inserts, based on the most commonly used by 3D printing enthusiasts. range from 3mm to 12mm. We hope you will like it. Secure fixation: Our brass threaded inserts are made of high-quality brass undergo precision processing, ensuring excellent heat conduction crosion resistance. Through testing, we have found that compared to straight-threaded inserts, the knurled threaded inserts provide stronger gripping strength can withst high levels of tensile fce. Clear labeling: Each specification has its own compartment in the plastic box, we have attached labels with detailed annotations f key data, making it convenient to use. Please note: the physical slightly col difference difference, does not affect the use, please do not mind, thank you!Plastic box romized , don't accept the specified! Colour:gold Material:brass Package Contents: 420 x Threaded Inserts Only the above package content, other products are not included. Note: Light reflection different displays may cause the col of the item in the picture a little different from the real thing. The measurement allowed err is 1-3cm.