"Keystone" is a generic term for the inserts that snap into special holes in walplates and rack mount plates. There is no official mechanical standard and several incompatible versions have evolved.
It is best to buy all inserts and plates made from the same manufacturer. Differences are minor; A
pocket-knive can sometimes make cross-vendor items work in a pinch, but you wouldn't want to do that for a whole project.
Leviton's version of keystone is called "QuickPort" and, as far as we know, is incompatible all non-Leviton products.
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