A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-01-114-3155
NSN 5998-01-297-3772
NSN 6150-01-201-3766
NSN 6320-01-501-7935
NSN 6610-00-227-8846
NSN 6105-01-052-4040
NSN 6105-01-234-3545
NSN 5945-01-050-2468
NSN 5998-00-921-8761
NSN 5996-01-136-4856
NSN 6145-00-443-0184
NSN 5910-01-332-2857