O-ring
From wipipedia.org
An O-ring is a (usually) metal ring shaped like a letter 'O' and fixed to the end of a flat strap or loop.
O-rings are an essential part of many pieces of bondage apparatus. They provide an attachment point on clothing or other equipment, and are the key component of ring gags.
O-rings are also built into some trousers, to hold the keys and assorted playthings.
See also
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