 M1 link

The M1 link, was the U.S. military designation for a steel disintegrating link designed for the M1917 Browning machine gun and M1919 Browning machine gun, and the .30-06 Springfield cartridge that they fired.A single round would hold two links together, and more could be added to make up a belt of any quantity of rounds, though for the mounted machine guns of the time, a belt of 250 rounds was most commonly used.