A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-01-265-8724
NSN 2925-01-515-7026
NSN 5835-00-905-7165
NSN 2925-01-394-5650
NSN 5996-00-850-4907
NSN 6110-01-411-5687
NSN 5950-00-269-0035
NSN 6135-00-444-1402
NSN 5895-01-224-3862
NSN 5990-01-013-8464
NSN 5998-01-659-5875
NSN 6645-01-070-1210