No QC Amazon?To understand what I am saying look at the images in the item description, the internal threads should look like pyramids, they don't.

I had about 1 in 5 didn't have clean threads, and if your hole isn't exactly lined up the threads will strip and bind.

Nice threaded inserts

The threads are not as smooth as they could/should be and benefit from running a tap through them after installation

I build many jigs and fixtures for woodworking and these are the best threaded inserts that I have found

These are actually strong enough to use, have legitimate threads, and don't break when installing correctly

They do work but the threads are dull, not sharp like shown.

I had previously attached the bracket with inferior threaded fasteners

Rating low because the internal threads are not strong.

The internal threads are sloppy as heck, these are very poorly made and would not meet SAE thread requirement dimensions.

They are solid, and threads are sturdy

The specs say to use a metric drill, however 11/32" is probably in your drill index and allows the proper thread depth

Worked as they should.