Zenport Finger Knife RK06-10PK Finger Knife, Size 06, Finger Knives, for cutting tape, opening boxes. Used for cutting. Also an excellent and inexpensive harvesting tool.
Available in a variety of sizes.
(Note: some put these on their pointer finger or over a glove which would require a larger ring size than your ring finger)
![Ring Knives: Handy for Cutting Twine, Boxes, Tape, Film, Harvest with Finger Ring Knives: Handy for Cutting Twine, Boxes, Tape, Film, Harvest with Finger](http://www.durokon.com/images/zenport/Ring_Knife_Ring_Knives_Handy_Finger.jpg)