Bought because of their attractive price these eyelets are of unparalleled mediocrity. Autoperforants you wrote? Well to make it self-piercing would first that the end of sub-cutting eyelets, yet they have a thickness (plastic requires), which is opposed to any drilling tarp. If you insist hitting with a hammer flange inevitably splits and all unusable. The plastic used to manufacture these grommets breaks easily. We must first of tooling at the right diameter to drill before the tarp eyelet. Unless they are only designed to make holes in the cake batter. This kind of product is banned, but really banish. You not only lose 1.5 Euros, but also and more: 5,30 Euros port which is really excessive for an expedition of a few grams. It really is theft, it mocks the world. This is the misleading advertisement. Believe in my experience, we will not still bother us to tell the truth about products that are increasingly poor quality. I would put zero stars if I had had the opportunity.