A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-00-295-2854
NSN 5985-01-305-1878
NSN 5965-00-989-9345
NSN 6145-01-056-5515
NSN 5990-01-094-7740
NSN 5996-01-318-3163
NSN 5998-00-100-0491
NSN 6645-01-320-4138
NSN 5990-01-400-3299
NSN 5855-01-144-0423
NSN 5915-00-699-4492
NSN 5960-01-024-7918