A versatile knife that can withstand the toughest tests is absolutely essential for survival and rescue operations. The Cold Steel SRK (Survival Rescue Knife) was designed with one goal in mind: To produce the industry's toughest survival multi-tool - a knife you can trust with your life, completely. In the USA, this tactical fixed blade knife was immediately received with enthusiasm by the military and its special forces. Due to its versatility and durability - even under the most difficult circumstances - it became the standard knife of the Navy SEALS for their combat swimmer training, among others. This version of Cold Steel's proven survival and rescue knife is equipped with an SK-5 steel blade and comes with a matching Secure-Ex sheath. SK-5 carbon steel. SK-5 Japanese carbon steel is traditionally used to make a variety of hand tools, such as chisels and wood saws. Due to its great universal toughness, excellent edge retention and outstanding abrasion resistance, this steel has proven itself in many countries.