These buttons are top quality first of all. They don't feel cheap at all and definitely feel sturdy if that makes sense.
The instructions say to just hammer them in to the fabric, however in my experience it is better to make a small hole beforehand, preferably with an actual punch that removes a tiny bit of the material from the hole. That will make the installation a lot cleaner and easier to do.
Also be sure to make the hammer hit directly straight on. The tack will bend quite a bit otherwise which will render the button pretty much useless.
Overall I'm very happy with the purchase and would buy more again. I'd suggest doing a practice run with your first one, just to be sure you don't punch ugly holes in your pants! After that you should be golden.
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