Theoretically, it is perfect because it doesn't require tools, but practically, it is not. If you don't tighten it very well, the pieces of string will come off. However, if you tighten it too much, you might need a crowbar to open it, as I experienced a little while ago in the field.

What they don't say is that when the manufacturer specifies two screws, we shouldn't put in all four, even if we have them. I put in all four screws in a new Kraft machine, and I almost burned it. As soon as I removed the two, it worked perfectly.

And what they don't include is a proper screw to attach the head to the machine, because the machine's screw may be larger and not allow for proper tightening. This happened with the aforementioned machine.

However, as a head, it is great, simple, and easy.

It is not practical because it goes in and out from the same side. So you have to put 2 locks in total

It is really easy to install and use, but it unscrews very easily and the threads come off. The hole it has for tightening with my wrench opened up and I have to use pliers to tighten it. I bought a similar Italian one with a plastic cap and it holds better.

The best. From the moment I put it on, I found my peace! I left aside a bunch of other mosquito repellent systems! Simple to use and effective!

That the most honest and best value for money I really put it on my machine and found my health I highly recommend it for purchase !!!!!!

The only problem is that it does not withstand over time as the turns easily wear out, the whole system is threaded.

Very good. Solid lock. It fit in a Stihl and I found my health. Even the factory chain that it has inside is excellent.

For me, it is perfect. Because I have tried more expensive ones and I can say that they always had problems, for example, the fishing line would often come off, the screw would loosen, etc. This one, for 5 euros, is the best. I highly recommend it.

Very good for its price, no need for a key to tighten, tightens with the hand. Fits all machines that take a cutting disc.

Although it seems simple to use....sometimes it can be frustrating...sometimes it drives you crazy...sometimes you need (a screwdriver with a large opening) to unscrew it and put the thread back in....Other than that, for 5 euros, we can't ask for much....

Excellent head, I have been using it for years. Convenient and comfortable change of line. Durable over time. Very good price. Choose it and you will be satisfied.