400Pcs Threaded Inserts, M2 M2.5 M3 M4 M5 M6 Female Thread Metric Knurled Nuts Assortment Kit, Brass Heat Set Insert for Plastic and 3D Printing Components (Threaded Inserts Ket)

M4 seems to be my go to size when I'm using threaded inserts. This pack was a great replacement for the lack of M4s on my workbench. I used them to finish a recent project of attaching a foot to a base for my leg lamp. It worked wonderfully and the price per piece was a nice value. Easy to install and very smooth threads.

Bought these for some 3d prints I made and they worked beautifully. Be sure to buy the heated inserter though, as well as the various sized tips for it. This make installation almost foolproof. Great quality and a good quantity in this kit.

The sizing is accurate, all are machined properly, and they go in and more importantly stay in. Threading is smooth and the small lip at the bottom does a great job at holding it in place when setting them. Will definitely buy these again when I need more.

Threads are true to size, no problem setting them in my 3d print projects. Lots of pcs for the $.

Great assortment for determining exactly what you need. You need to order larger quantities when you actually use these.

Needed these for my 3d printing They work as intended

Perfect assortment for a variety of small to larger machined mm hex, flat head screws. Perfect for Hobbiest working with plastic and 3D products. Great price, fast shipping.

Purchased for a 3D print worked great!