BlackJack Knives Lapel Dagger These are rare and only a few were produced before BlackJack's factory in Effingham, IL closed in the 1997. The 2.5" long blade is designed to be gripped between your thumb and forefinger, and is made of super-strong glass-filled nylon resin. Includes two clear plastic sheaths with holes around the perimeter for sewing onto the garments of your choice (one for your black leather jacket, one for your tuxedo lapel). The knife locks into the sheaths very securely for unlimited carry options, including fully inverted. Modeled after the clandestine lapel knives of the famous OSS of World War II, this modern re-interpretation is an awesome addition to any modern spy equipment or unusual knife collection.