The Knife Ring

The Original Handy Safety Knife - 12-Pack - Utility Ring Knife for Finger with Sharp, Curved Blade - Ring Size 10 - Black - Standard Blade - by Handy Twine Knife

Razor's Edge Safety Knife - Utility Ring Knife for Finger with

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Dieffenbacher MRZ / Knife Ring Flaker - defortec GmbH - Industriedesign in Tübingen, Stuttgart

These are small little knives that fit on your finger, and they are used to quickly cut butchers twine and casings through production. They come in

Ring Butchers Twine Knife

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2021 New Adjustable Finger Ring Blade Self-defense Ring Outdoor Security Defense Jewelry Tool Hand-stabbed Hidden Knife

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Ring Slicer