Product review (5 stars): If you insist on doing this yourself, get this for your sanity.
This is a one-use tool: to spread apart the coiled section of the metal rings around the washer's door gasket/boot seal. For my oldish LG WM2301HW front-loading washer, this plier worked for both the outer ring and the inner ring, which is a far more difficult task, especially if you don't remove the front panel.

The price is outrageous. I'm not sure how much money I saved by doing the repair work myself after buying this thing, but it's not much. Now that I know how to replace the door seal and the tub-to-pump hose, I may have more opportunities to use this tool, though I hope not because it wasn't fun. I didn't subtract any stars from the rating because this is a very valuable tool for this specific task. And, I'm a clumsy person who managed to get the rings on and off solo.

If you insist on repairing your own LG (which isn't that unusual, considering how many appliance repairers don't service LGs, partly due to the awful parts supply chain), get this. It does exactly what it's supposed to do, making your life so much easier.