Nichols inquest: "cuts must have been caused by a long-bladed knife, moderately sharp, and used with great violence"
Chapman inquest: "the instrument used at the throat and abdomen was the same. It must have been a very sharp knife with a thin narrow blade, and must have been at least 6 in. to 8 in. in length, probably longer. He should say that the injuries could not have been inflicted by a bayonet or a sword bayonet. They could have been done by such an instrument as a medical man used for post-mortem purposes, but the ordinary surgical cases might not contain such an instrument. Those used by the slaughtermen, well ground down, might have caused them. He thought the knives used by those in the leather trade would not be long enough in the blade."
Eddowes inquest: "The wounds on the face and abdomen prove that they were inflicted by a sharp, pointed knife, and that in the abdomen by one six inches or longer."
No opinion on the knife offered at the Stride and Kelly inquests, apparently.