[ J&J Products, Inc ] M3 Brass Insert 100pcs,5.5mm OD, 3.9mm Length, Female M3 Thread, Press Fitting or Heat Sink or Injection Molding Type, 100 pcs

I used these on a 3D printed project and they worked great !!!

These do not have the lead-in like the picture shows. So buyer beware! I've knocked off 3 stars because of this. I am working on a project and don't have the time to send these back and order more so they will have to do, but if you need/want the lead-in, these do not have them like the pictures show.

I have purchased this item twice before, and it was perfect both times. This time around, I was provided with a vastly inferior part, the dimensions of which are totally incorrect for the holes I incorporated into the printed models. These are useless to me.

Item received was not accurate to to the item in the images. The image shows the brass inserts having a longer extended piece on one of the edges, but the ones I received are symmetrical like all the other listings on Amazon at a lower price.

Doesn't match the product image. This is a symmetric insert and doesn't have the needed lead-in for heat staking. The length is correct to the item description but the item photo is misleading and incorrect.

Just like the other reviews. The inserts are symmetric and don't have the shoulder.

Item shipped and described not what is shown in pictures.

does not even vageuly resemble to pictures in the listing, and the knurling is extremely shallow and OD of the insert is far too large. As a result these twist out extremely easily, rendering them useless.