Hi does anyone know where I can source any larger round grommets ? I will be drilling a hole in 100 Ă— 100 trunking so guess around 75mm hole. I've seen larger grommets before but they were a different material to rubber, they were like rubber but had fibre in them, a bit like bicycle tyre material; dont know if these come in a strip or were round. I dont want to use that plastic strip like found in consumer units as there not much lip on them to hold it in place. Can anyone help; cant find anything over 32mm and not even sure if theres any standard grommet sizing over 32mm !