Ordered these eyelets for a plastic tarp and I do not see at all how these eyelets are autoperformants, they do not accept under penalty hammer blows to be pulped even forcing hand they do not pierce the cover and end up breaking. In the end it is better to drill the hole first and do not use excessive force on such poor quality grommets. On the other hand for the price you should not have to expect much from great. 10 eyelets, 1 of 3 left in the trash
