Additional eyelets are always recommended to supplement those already available on a tarpaulin. By creating more fixing points, any load upon the tarpaulin is spread which will mean less pressure on individual points and it will help to lengthen the lifespan of your tarpaulin.
The eyelets are 20mm in diameter and made from tough UV stabilised polycarbonate. To use, simply pierce a hole in the material and feed the male part through one side and place the female part on the other side. Then, using an implement like a mallet, bond the eyelet tightly.