Made from hardwood with a wood saw, drill, dremel, and sandpaper. I got the awesome sandstone look from soaking the knuckles in bleach. The design is of my own. Maybe I'll make a metal one in the future? :D

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A stick isn't a weapon....it's a stick, and they're legal to own LOL.
Hit someone with that stick or tell someone that you're going to hit them with that stick and it now has gone from being a simple stick to a weapon.
Simple verbage can be the difference between being perfectly legal and being taken to jail.
Come to thin of it, my brain can lash out harmful injuries to someone. Morganbarker's correct about anything being considered a weapon. Golf club, knife, frying pan or purse. If it harms or threatens to harm it's a weapon. If a jury or judge has to decide upon looking at those knuckle hitters or an innocent looking household item they'll see something more into that intentional knuckle gizmo than any thing else.