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If you have a larger hole you want grommeted to allow safe cable/wire runs to pass through sheet metal I have a solution.

Use vacuum hose.

Trim off a piece a little longer than the hole's circumference. Use a sharp pair of scissors and split the hose down the outer diameter edge. (This refers to the way the tube naturally bends as it is usually packed in a roll so you might as well go with the flow.) Now simply press the cut edge over the sheet metal hole's edge. When you get back to the start trim it just a tiny bit long so it is slightly compressed on the final inserted edge so the butt ends close up tight. The wall of the vacuum hose now will allow the wires to pass without abrading the insulation and avoid shorts.
Bob J.

You can also buy hose that is already split. I have some that’s about 1/8” or so in diameter that I use as a seal for the Treadlevac air filter housings but it would also make a great grommet for protecting wiring etc. through holes as you described.

I had a large hole in the tool/battery box of my trailer and I was installing a wench. I found a 1.5" plumbers Fernco connector and used that as a sleeve for the wires going through the hole. The Fernco was slightly bigger than the hole, so it took some shoving (and maybe some cussin'). It has stayed in place.

Rubber hose works well in larger holes and is usually easy and quick to find but for cases where you have a smaller hole or the hose might be a bit too bulky or you just want a more subtle look McMaster has a decent selection of rubber edge treatments which are more flexible and work better with small holes than the plastic types. Both rubber and plastic styles are available in various sizes and shapes. Here are just a few of the rubber styles.

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I have found adult words always are needed in any difficult work!

Great stuff everyone. I really like the large range of ideas from this group.

I've always bought the assorted boxes of grommet and rubber plugs and they have always come in handy.

A pro tip for installing some of large stiff grommets, use a heat gun to get them hot first. Then that are soft enough to work the into and over the sheet metal. When they cool, they so back to their former semi rigid state.