M390 Titanium Knuckle Duster MultiTool

Modeling: defense mini finger ring finger tiger
Tritium tube size: 1.5*6mm
Blade material: M390 steel (vacuum heat treatment)
Ring material: TC4 titanium alloy
Hardness: 61HRC
Spindle: HSS high-speed steel
Glass bead: ceramic ball
Size: 9-13
No.09 inner diameter 18.9mm
No.10 inner diameter 19.7mm
No.11 inner diameter 20.6mm
No.12 inner diameter 21.4mm
No. 13 ID 22.2mm

Tips for choosing a ring cutter: Measure the finger circumference to be worn.

• Take a strip of paper with a width of less than 2cm and wrap it around the measuring finger for a week; the strip of paper needs to be close to the skin to avoid errors; pinch the intersection of the strip of paper with your fingers, mark the intersection, and use a straightedge to measure the length to the mark.

The blade is M390, the finger ring is titanium and upgraded features include the blade being thickened to improve retention, the split design being disassembled, the tailbone being disassembled, titanium color, and blue and black optional.
PS: Removing the blade to wear the finger ring alone is the function of a pure ring.