9" Knuckles knuckle Trench Knife Spring straight out automatic otf assisting out the front spring knife Blade Tactical Brass Aluminum Combat Military Camping Survival Tool | Wish
Dark Assassin Knuckle Knife - Thin Combat Chakra Blades - Ninja Knuckle Knives | KarateMart.com
Fantasy Master Scorpion Brass Knuckle Knife (FM-617R)