A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-00-050-9831
NSN 6610-01-259-5296
NSN 5835-01-163-4215
NSN 6150-01-433-0315
NSN 6135-00-862-5736
NSN 6145-01-274-6190
NSN 5920-01-200-6655
NSN 6105-01-634-0322
NSN 6685-00-225-8571
NSN 5855-00-361-0167
NSN 6220-01-513-5022
NSN 5950-00-233-6853