Bingley... though I've used my wonder bar to break chain link fence without deepening the nail notch... it slips occasionally.. if the sides of the nail notch are deepened, and cut more parallel, and the wire diameter fits rather tightly, a quick lift (90 degrees to the direction of the wire) can usually break the chain link... the wire is not very ductile and usually snaps... I know you are a knife person... this is found on a lot of the military fixed blades