Thread Cutter Ring — 'Jane Bond, call your office'

From websites:

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Slip this lovely ring on any finger to easily snip any type of thread — simply, smoothly, and quickly.

Provides fingertip convenience while sewing or crafting, eliminating the tedious search for scissors.

Brass with stainless steel blade.*

Adjusts to fit most fingers.

1" diameter.

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$7.99.

*I'm thinking this will likely be confiscated if you have it on your finger when you go through airport security.