brass knuckle
thingiverse
it goes around your finger for self defense toward people P.S. I am not responsible for any problems this might lead up to.*
Download Model from thingiverse
With this file you will be able to print brass knuckle with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on brass knuckle.