This is a newly invented, patent pending folding knuckles.

When folded it is 4' long and 1.5 wide. The height is 0.6'

When unfolded it is 4.6'*2.75'

It can be used folded, it will protect the index finger then.

It has a liner lock, so it will stay opened untill you press the liner like on a folding knife.

The finger holes are 1' wide and 1.15' long so it fits all palm sizes except Shrek size. 

Please know your local laws, brass knuckles are forbidden in many states.

This is a full size (when opened) knuckle duster made of 316 stainless steel.