The Zirah-Bouk Dagger
The Zirah-Bouk is a dagger from India and Persia has been used as an armored binoculars. Its name means literally means “Mail Piercer”.The dagger has a double-edged, slightly curved at the place, and thick blade. This one has a smooth surface, without medial ridge or hollow.
The blade is forged in a heavy diamond cross section and reinforced. This kind of shape of blade make it a very effective tool to be forced through a chain mail. The blades are often made of wootz steel (cast Damascus).
The handle is usually made of metal or horn decorated with Indian designs. There are cases in which the handle is made of silver or gold deposits (koftgari). Some variants of the Zirah-Bouk have a full metal construction, manufactured in one-piece .
Source: Wikipedia | Book: ”A Glossary of the Construction, Decoration and Use of Arms and Armor: in All Countries and in All Times”, by George Cameron Stone.