120 Pieces M3 Threaded Inserts, Premium Heat Seat Inserts for 3D Printing, M3x4x5 mm Metric Knurled Nuts, Brass Threaded Inserts for Plastic

They are as described and work great in my 3d print projects. Threads are smooth and engagement in plastic is great.

Simple little parts - just push them into your print with a soldering iron and you are good to go. For my uses, I made a hole 4.5mm in diameter. These are really useful to have around and they seem to be made well. Would definitely recommend!

Did exactly as they were supposed to do. I love these things

I originally went to a local store to purchase the item, since they claimed they had them in stock. Drove 30 minutes and they could not find them. Got home and logged onto Amazon and they were here the next day!They worked well. No instructions included so if you have not used this type of inserts a quick search on YouTube is recommended. I also ordered another set of heat-set tips for my soldering iron to use on the threaded inserts. They are not needed but makes the job a lot easier.

I like how organized this set is and that it comes with several different sizes. I. Still working on dialing in the settings, but basically you size the hole for a press fit, and then heat it up to push these in. Then BOOM - metal threads in your 3D printed part.Definitely makes it significantly stronger.Would recommend.

Good quality item. Works as expected. No issues.

Does exactly as it should. Good price.

I was a little worried about buying something so cheap, but they work well.