"I was fitting some replacement sockets (posh ones) for my daughter. She had her home rewired a few years ago by a professional, so I was a bit surprised to find that there were no grommets in some of the metal back boxes. I'll never use 100, but at least now when I come across one missing, because I've put some in every toolbag I've got I'll never be short of one.,"
"These are great quality. They hold in the punch outs really well. When using standard electrical back boxes for hiding 10mm heating pipe you can even pull the pipe though without them popping out like others do. They are 10% more than toolstations but worth it. They are also slightly more fiddly to fit."