Folding Steel Knuckle Duster Safety Defense Tool

Material: Stainless steel
Inner diameter: 23mm
Outer diameter: 33mm
Total thickness: 26mm
Weight: about 88g

Folding knuckle is a multifunctional defense tool, it is made of solid steel, strong and durable, it can be folded, easy to carry, and can be used as a decorative accessory or to train finger dexterity.