Convenient 10-pack of the classic, combat-tested FlyBoys Checklist Rings that have been in widespread use throughout the military for many years, and are the #1 checklist ring in use by the US Air Force. Designed to accommodate standard-size checklists, the FlyBoys Checklist Rings are 1.75 inches when locked, and feature the FlyBoys-exclusive stainless steel locking mechanism. The ring is constructed from heavy duty monofilament plastic, ensuring years of trouble-free use in the toughest operational environments. Available in opaque, black, red, and blue.