The Ontario ASEK® Aircrew Survival Egress Knife is used by the Air Warrior Program and other branches of the US Armed Forces. It features a knife built of 1095 carbon steel with a Rc of 50-54. The blade has a serrated edge and sawteeth on the spine. The ASEK Knife features a one pice molded handle with spear holes. The insulated handle is molded over the guard and the butt cap on the base of the knife can be used as a hammer. The butt cap also features a lanyard hole and a glass breaker capability. The ASEK system comes with a flame retardant nylon sheath with a Kydex insert to protect the blade as well as two log protectors and straps. The ASEK System also comes with an anodized aluminum strap cutter that sports a screwdriver, honing rod, lanyard and replaceable blade. This knife is ready for whatever life throws at you. Specifications: Blade Steel 1095 carbon Blade Length 5 inches Blade Thickness .1875 Overall 10.25 inches Weight 1.25 LBS (entire System) Handle Material Blade Color Zinc phoshate (black) Sheath Color Green Country of Origin USA