Kadrick200Pcs M2 Threaded Inserts for 3D Printing Components,M2*3 * 3 Metric Brass Knurled Nuts, Insert by Heat into Plastic Parts

Great assortment of inserts and work really well in 3D printed parts.

I needed a variety pack to see how big they were and what sizes would fit for my project. In the future I will just buy more of the size that I need, if I run out of these. They are of good quality and work as expected.

Great selection. Perfect for 3D printed parts which is primarily what I use them for.

These are very nice. Hard to find exact replacements for each size however in the US. For example I used all of the largest size but can't find another bag of just those for sale

Accurate dimensions, clean, and quality inserts. I never have any problem with Kadrick, including with their fasteners, and after receiving cheap, paint-dust-covered, subpar product from a different vendor, Kadrick is the way to go.Ideal hole diameter for 3d prints = 4.5-5mm depending on your setup.

I've already used these in multiple projects to great success. However, they came reeking of machining oil, which I washed off with dish soap in case it would affect the security of the melted interface, especially on the very small pieces.

These are easy to sink into most plastics with a soldering iron and they stay put. They enable parts to be tightly connected without glue.

Work great and cheapest