Class 1 rings, other than configurations W, X, and L, are intended for use in connection with textile, webbing and leather items where the corrosion products of ferrous metals may adversely affect the textile, webbing and leather items.

Classes 2 and 3 rings, other than configurations X and D are intended for use as alternates to class 1 rings in periods of emergency. These also may be used where a specific requirement for additional strength is necessary.

Class 4 rings are intended for use on animal equipment in special applications where high resistance to corrosion is required.

Configuration W rings are generally used on Munition Command items; configuration X rings are generally used on Weapons Command items; configuration L rings are generally used on Electronic Command items.

Configuration D rings are generally used on animal equipment.