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The phrase 'key ring' is correct and usable in written English.
You can use it to refer to a metal ring used to hold multiple keys. For example: "I had so many keys that I decided to buy a key ring to keep them all together in one place."
Dictionary
key ring
noun
Alternative form of keyring
Exact(54)
Did you write in KEY RING before you got KEY CASE at 42 Down?
I bought a key ring for £1.99.
The gift: key ring in chocolate-colored calfskin ($160).
Three winning shots got you a key ring.
Nancy's like, Dad, & her actual designer KEY RING goes faster?
When you're fiddling with your key ring during a meeting.
Similar(5)
Some dress in green, or less ostentatiously sport a green cigarette-lighter or key-ring.
There is a chain in it; could be a key-ring.
They include key-ring flashlights, battery-powered camping lamps, landscape lights and under-the-shelf lights.
Key-ring loops and double-sided adhesive strips let you attach the tags to straying items.
If it is a key-ring, you could place it on the outside of the bag.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com