Kadrick 420Pcs M3 M4 M5 Threaded Inserts Assortment Kit for 3D Printing Components, Metric Brass Knurled Nuts, Insert by Heat into Plastic Parts

I appreciate the nice selection of sizes and overall quality of these inserts. They work fine for my applications. Install easily using the Kadrick soldering iron tips. Since my application tends to be "one and done" use where the screw is seldom, if ever, removed, I can't comment on durability. I don't see any red flags that make me think these are less durable than any others that I have used. If I have one negative comment, it is that I would like the assortment to include more sizes of M4 and perhaps fewer M3. That said, this provides plenty of selection for prototyping parts and validating design and functionality. If I find that a different length insert in the prototyping stage, that is easy to resolve when I purchase larger quantities for production runs.

Great for my hobby level 3D printed parts. Excellent assortment, all seem very well made and are highly functional. They fit my heat set kit well and I have found none that seem mal formed so far. Will buy again.

Love this Kit, has different size fittings, wish there was a kit that also includede the screws, perfect for our little 3D printing projects

Really easy to use and makes it very simple to add a threaded hole in plastic. I used it to add a radio to a pelican case using a regular soldering iron.

Works great

This is a great selection of Threaded inserts and it really steps up my 3D printed parts to quality Assemblies

This is now my favorite brand to use, that I will only use.

good sizing that I needed for a project. I have several that will need the other sizes in the kit.