A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-01-592-3175
NSN 5965-01-371-1297
NSN 6320-01-029-4220
NSN 5985-00-343-3632
NSN 5920-01-418-7423
NSN 6110-01-545-6079
NSN 5985-01-585-7517
NSN 6685-01-387-6505
NSN 5895-01-528-6831
NSN 5905-01-594-2937
NSN 6645-01-473-9179
NSN 6645-00-145-6411