A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-172-9092
NSN 5910-00-689-8168
NSN 6110-00-161-4115
NSN 6610-01-133-2602
NSN 5920-01-350-5140
NSN 5985-01-415-0274
NSN 5925-01-101-3386
NSN 5915-00-132-5531
NSN 5915-00-236-8097
NSN 5975-00-940-7820
NSN 5975-00-660-5171
NSN 5965-00-538-4485