A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-00-313-9114
NSN 6110-01-355-8083
NSN 2925-01-259-7092
NSN 5855-01-609-5749
NSN 6610-01-069-8416
NSN 5996-01-231-2062
NSN 5935-00-948-7732
NSN 5920-00-180-4278
NSN 6645-01-171-4528
NSN 6220-01-651-6453
NSN 5935-01-200-0166
NSN 6650-01-142-5540