Used on nimitz class cvn; arleigh burke class ddg; whidbey island class lsd; seawolf class ssn; submarine auxillary and miscellaneous systems; wasp class lhd; mine countermeasures support (mcs) class (lph-12); forrestal class cv; trident auxiliary systems; submarine ship control and navigation systems. 3.560" center hole diameter set consists of 5 each of above dimensioned rings