Afghan knife penetrated armour

"The mutilations of Nichols, Chapman, Eddowes and Kelly," said Dr Bond, "were all of the same character. They were inflicted with a strong knife, very sharp, pointed at the top, about an inch in width and at least six inches long. It may have been a clasp knife, a butcher's knife or a surgeon's knife," he speculated, "but I think it was no doubt a straight knife."
Pesh-kabz, peshkabz, peshkab, something or other, Afghan knife penetrated armour. The Khyber knife both cut, stabbed, and punctured bone.