Wide Application - Thread inserts for plastic suits for mobile phone cases, PC cases, plastic parts for motor vehicles, injection molded parts, etc. It can also be used in 3D printing. The set contains 520 knurled threaded nuts, packed in a durable clear box. Different sizes meet different requirements. Easy to use: insert into the hole of the component, heat the threaded insert with a soldering iron. After heating, press the threaded insert into the component. Then cool and tighten the screws. Thanks to ultrasonic or soldering irons, insertable nuts can be easily inserted into a bag or through hole. Thanks to the straight knurled surface of the recessed nut, the nut fits firmly into the mounting object., Weight: 0.2535316013 Pounds, Manufacturer: Rtxbvg