The Ontario Knife 6150, 499 Air Force Survival Knife has become an Ontario CLASSIC also used by US Armed Forces. The 5" plain edge blade has a .17" thickness with a flat bevel with swedge grind and an HRC of 50-55. A zinc phosphate finish over the tough high carbon 1095 steel helps protect from rust. Unique to the Ontario 6150, 499 Air Force Survival Knife is it's brown leather wrapped handle which is about 4.5" long. The Ontario 6150, 499 Air Force Survival Knife has an overall length of 9.5". The Ontario 6150, 499 Air Force Survival Knife carries on a belt loop with a brown leather sheath with a sharpening stone. The 499 pilot's survival knife has been accompanying members of the US Armed Forces for Generations. Designed to save lives in virtually any situation, the 499 truly embodies OKC's promise of being The Knife You Need When You Need A Knife.