What is this for?

pishta said
easier to use than a stupid can or strap wrench to take the filter off. More leverage too. Filter destroyer....

i like to use these to remove them, gets you in tight spots since you can put as long an extension on as you need
i like to take mine apart and put a bunch of axle grease on the gears so the fingers dont open as you try to put it on

S'cuder said
They work good in tight places. Only good for removing since you never want to go more then fingertight on a filter .

3/4 to 1 full turn after gasket contacts base, even if that means using a filter wrench. Not a filter destroyer wrench, obviously. Some filters even have an illustration on the side, and handy numbered reference points every 90°.
Around 1990, I had an old timer for an oil customer, who has since passed away. He always insisted "hand tight." Our filters were made by Purolator, because Pennzoil owned them at the time. He installed one of our filters on a 302 Ford, which leaked, and the engine blew. He put in a claim, and our tech people tested the filter to 100 PSI. The claim was denied, because the filter didn't leak. The failure was blamed on incorrect installation. I lost the account, but got it back a year or so later, but oil only.
Moral of the story: If you don't crank that sucker down a full turn, don't blame the filter when it leaks at the gasket.

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interesting
ill keep that in mind
honestly never noticed instructions printed on oil filters