Kadrick Small Metric Screws Suitable for 3D Printer DIY, 400 Pcs M3 Screw and Nut Assortment Hex Socket Head Cap, 12.9 Grade Alloy Steel,Black Zinc Plated

Given that M3 is one is the most popular sizes for period who make functional 3D printed objects, this is a great assortment for people in that hobby. The threads are cut cleanly and the black coating seems durable so far with bone having chipped or rubbed off. Given that they fit nicely into my M3 heat set inserts and that I've been able to use nuts from this set on other M3 screws, I'd say the manufacturing accuracy is pretty good.

Exactly as expected. Good quality and just the right sizes and plenty of them for a great price. I ordered these to construct a 3d print project (fold out SD/MicroSD card holder). The 16mm head was just slightly (such a tiny little bit) bigger in diameter than the 20 mm. So i had to use one of the 20 mm instead for one corner. This will probably not make a bit of difference for literally anyone else, but figured i'd mention just in case. I placed and removed one screw like ten times and the black didn't come off, the head stayed the right shape so quality seems good. Comes with a helpful little alan key and a teeny magnet that makes the tiny pieces just a little bit easier to use when trying to pick up and place them.

Perfect for my application, fasteners seem to be good quality.

Perfect screws well made they will work.

If it's the size you need you won't be disappointed. They are screws and they seem well made. Can't go wrong.

Useful need quick fix for a computer. Did the job.

Good choice for how the packages look. A bunch of options to choose different sizes or types of screws. Super easy and fun to have a larger quality to choose from.

Great quality set, no screwing around.