The dag was fashioned after the large stone spear points. It was strong and could be used for heavy chopping, as a spear point, a utility knife, skinning and butchering, a spear point and as a weapon. They were shipped to North America from Europe by the barrel load. There were also made by resident blacksmiths in the trading posts. They were traded without handles. The handles were usually ornate and made of wood and often tacked. Some beautiful knives were made with a bone handle with a serrated copper ring at the top for a scrapper. They are often seen with a universal "circle" and "dot" design in the bone. They most have been very common in the mid 1800's as early explorers noted natives wearing them with a thong attached to their wrists. They are often marked with a makers name such as "Jukes Coulson, Stokes & Co." or "IS" for John Sorby. Some very desirable dags are marked with a "Circle" and "Sitting Fox" design which was traded by the North West Company. They are also known as the "Columbia River Knife", in some areas it was called a "Beaver Tail Knife".