A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-01-467-1192
NSN 5920-01-468-4791
NSN 5960-01-017-0989
NSN 5895-01-428-4126
NSN 5915-00-480-9649
NSN 5985-01-646-7012
NSN 5895-00-684-6879
NSN 6685-00-854-9169
NSN 5945-01-475-8117
NSN 6135-01-310-9866
NSN 5920-01-476-0758
NSN 6650-01-556-0983