A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-623-4200
NSN 5895-00-074-9550
NSN 6645-01-064-3711
NSN 6685-01-504-1213
NSN 6135-01-108-6057
NSN 6320-01-415-0953
NSN 5996-00-250-5149
NSN 6135-01-442-7275
NSN 6135-00-856-1343
NSN 5965-01-399-8454
NSN 6320-00-725-0754
NSN 5975-01-028-1926