A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-00-891-9850
NSN 4140-00-931-4854
NSN 6135-01-423-7502
NSN 6145-00-764-4338
NSN 6110-01-018-3654
NSN 5999-01-310-7223
NSN 6105-01-274-3570
NSN 5925-01-381-5199
NSN 7035-01-514-4617
NSN 6145-00-419-0550
NSN 6685-01-479-2365
NSN 7035-01-248-4319