A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-254-8584
NSN 6145-01-569-4761
NSN 6650-00-710-8130
NSN 6610-01-415-5877
NSN 6320-01-322-8340
NSN 5996-01-245-6121
NSN 5895-01-392-0294
NSN 5905-00-148-8153
NSN 6145-01-336-9352
NSN 5990-01-400-3299
NSN 5855-01-100-3272
NSN 6130-00-177-3142