mate, if you are after a traditional net, i dont know much but can tell you what those 2 are, on a traditional you have hazel poles (or fiberglass) usually 5 yard apart. On each end, to keep everything tight, you have 2 metal end pins, this is kind of a gian washer on a strong metal pole, not very long. You can also collect your net on this. The grommits, as far as I know are for the quickset nets. These are usualy a rubber type ring, which goes tight on the pole fixing the top and bottom line in place, stopping it from slipping or sliding. I dont personally know anyone which uses grommits on