A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-027-0762
NSN 5950-01-016-8381
NSN 6645-01-423-4617
NSN 5998-00-420-1448
NSN 6110-01-471-3364
NSN 2925-01-415-0264
NSN 7035-01-479-5268
NSN 6240-01-003-8666
NSN 6110-01-472-1963
NSN 5855-01-366-2040
NSN 6320-01-170-4068
NSN 6145-01-545-6348