Cops busted an East Harlem stabbing suspect carrying a terrifying-looking weapon — a red version of brass knuckles shaped like a scorpion, complete with dagger-like pincers and a stinger tail, authorities said Friday.

The 29-year-old suspect, Curtis McDaniel, was arrested Friday afternoon with the weapon and charged with felony assault in the Feb. 17 stabbing, police said.

His 23-year-old victim suffered two puncture wounds in the attack, cops said. The victim is not cooperating with police, they said.