Dull, won't cut, caused a lot of frustration. I bought it a year ago, so maybe it was a bad batch back then. Whenever I replace the knife I go ahead and rebuy a new knife in case I need it. I just replaced it, it won't cut the fabric (thin or thicker), causing the fabric to turn in or jam. I ended up getting another set from a local store and the new one works, which led me to believe this particular one wasn't right. And I did check the settings, take off reinsert, and clean before giving up.

I bought these to replace the knives of my Brother 1034d. I had ruined mine with a pin -I know, bad habit! But since then I've only used pins on the left side of the blades! After the pin incident, the knives were dragging in the fabric(especially rayon knits!)

I had never attempted to change them before so I was nervous about doing it myself. But didn't want to spend the $ or time without my serger if I took it to have it serviced. So I just dove in, and found it to be extremely easy!!! Luckily in the 1034d there are metal pieces that they rest up against to hold them at the correct angle.

A few things to remember if you're trying to change your knives:
1. the lower knife should be flush with the needle plate
2. Put them on in the opposite order that you take them off- ex. On mine, I had to take the upper knife off first then the lower. I replaced the lower first then the upper.
3. The 1034d has a washer with the upper knife only, which is small and easy to loose. I put it with the screws in my thread catcher & next to the old upper knife while changing so I wouldn't accidentally knock it off the table or loose it. And in keeping it next to the upper knife, I knew which knife it went with.

I'm so glad I did it myself, as they cut just as well as it did when I first got it and for a lot less $ than taking it in for repair!

I broke my upper knife when I hit a pin. I bought this set so that I could replace the upper knife and have the spare for my lower knife when I need to replace it. It is a slightly different shape than the one that was on my serger, and the lower knife came already looking worn and rusty. I will keep it as a stand by, but probably find a different set.

I have not had to use it the upper and lower knives yet. I'm still using the first set I ordered. If they work as well as the first ones ordered, I'll be very happy.

great