A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-01-605-9921
NSN 5990-01-604-0862
NSN 5920-01-295-0107
NSN 6220-00-983-6920
NSN 5925-00-960-5214
NSN 6220-01-654-0007
NSN 5925-00-840-9071
NSN 5990-00-804-4982
NSN 5985-01-253-8695
NSN 6685-00-489-0790
NSN 5996-01-248-9699
NSN 5985-01-630-9551