A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5925-00-763-8079
NSN 6610-00-281-9516
NSN 6645-01-025-1002
NSN 6320-01-521-1764
NSN 6135-00-274-4037
NSN 5999-01-122-9902
NSN 5999-01-468-7463
NSN 6135-00-334-4500
NSN 5960-01-431-4291
NSN 5985-01-512-2886
NSN 4140-00-021-2807
NSN 2925-01-524-6622