Ontario Mark 3 Navy

History and Durability

The Mark 3 is the standard knife

Knife

A knife is a cutting tool with an exposed cutting edge or blade, hand-held or otherwise, with or without a handle. Knives were used at least two-and-a-half million years ago, as evidenced by the Oldowan tools...

 for the US Navy and Navy SEALs. The knife made its first debut in World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

, and is known as a KA-BAR

KA-BAR

KA-BAR is the contemporary popular name for the combat knife first adopted by the United States Marine Corps in November 1942 as the 1219C2 Combat Knife , and subsequently adopted by the United States Navy as the U.S. Navy Utility Knife, Mark 2...

 era knife. It features a 6 1/2" 440 stainless steel

Stainless steel

In metallurgy, stainless steel, also known as inox steel or inox from French "inoxydable", is defined as a steel alloy with a minimum of 10.5 or 11% chromium content by mass....

 blade. It has a saw tooth back and a black oxide

Black oxide

Black oxide or blackening is a conversion coating for ferrous materials, copper and copper based alloys, zinc, powdered metals, and silver solder. It is used to add mild corrosion resistance and for appearance. To achieve maximum corrosion resistance the black oxide must be impregnated with oil or...

 finish, with high impact plastic handle and sheath. People have found many uses for this knife, including using the butt as a hammer

Hammer

A hammer is a tool meant to deliver an impact to an object. The most common uses are for driving nails, fitting parts, forging metal and breaking up objects. Hammers are often designed for a specific purpose, and vary widely in their shape and structure. The usual features are a handle and a head,...

 and the blade as a prybar. The blade is said to hold a great edge and be very durable, and if taken care of properly, this knife can last a lifetime.