Some claim it's made of hard plastic, but that's not true. Definitely something malleable, not hard hard plastic. A good balance of stiffness and some flex to ensure a secure fit in a certain sized hole. The size listed is the hole it will fit and sit securely in thin materials (as listed). Not for accidental wrong size holes. I used 1/4" to fill the holes in the plastic wrap, drilled from 3/16" to 1/4" to match this diameter insert.
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