This is a Military Issue Survival Wire Saw. This is the same type of pocket saw always carried by famed test pilot Chuck Yaeger. Badly burned after being forced to bail out during a test flight at 104,000 feet, this is the saw used to cut through his pressure suits neck ring to remove his helmet. Lightweight and compact, it can be coiled up into a shirt pocket or easily included in survival and camping kits. This survival saw has been used by the U.S. Military for over 30 years. Originally developed by the USAF for a pilot survival kit, this saw meets the government specification NSN 5110-00-570-6896. This saw comes with sturdy steel removable end fittings with heavy duty rings and comes with a spare blade. The removable rings allow for a blade change or if the blade breaks the rings can be fitted to the shortened blade. IT IS MADE IN THE U.S.A.. This is the finest survival pocket saw made. It is a spiral wire saw, not the cheap strand wire saws seen on other sights. This saw will cut metal, wood and plastic in any direction. It comes packaged in a padded envelope with instructions.