Osprey takes our Raptor Lite Ring and rounds out the bottom to give it a comfortable feel on your hand.  It is a titanium ring with a single retractable blade that pivots out.    The stainless steel blade can be used to open boxes or cut packing tape or can be used as a last line of defense.

The ring is custom made in exactly your size.  The width remains at 4mm.  The Brushed finish seems to work best, so I left off those options.  The inside of the ring gets a polished finish for comfort.

Although the ring can be engraved, the internal lines will affect the letters a bit. I recommend the Roman font if you will be engraving inside. Please keep engraving to 10 characters or less.