Original used swivel bails for the M1 helmet. Can be used on WWII - Korean or Vietnam War helmets. These need to be spot welded in place. It is not recommended to solder, braise or glue them in place. These are sets we knocked off of helmets we restore. We keep the best ones so they can be reused. If you're already spot welding or have an aptitude for simple metal work these will be no problem for you to prep and use! You will get 10 bails total. Enough to do five helmets.