A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-01-575-3275
NSN 6150-01-433-2091
NSN 6320-00-937-5625
NSN 5905-01-592-6257
NSN 5835-01-303-6563
NSN 6620-00-635-2417
NSN 5855-01-059-2710
NSN 5965-00-342-5126
NSN 5905-01-346-4222
NSN 6620-01-179-0779
NSN 6650-01-250-8211
NSN 5945-00-389-6311