A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6105-01-152-2800
NSN 6130-01-325-9904
NSN 6150-00-735-1276
NSN 6240-01-296-0587
NSN 5910-01-512-8782
NSN 5930-00-010-1588
NSN 6645-00-915-9397
NSN 6685-01-137-8517
NSN 6620-00-473-3692
NSN 5920-01-395-0374
NSN 5855-01-276-0353
NSN 6130-01-566-1084