A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-199-2836
NSN 5925-01-055-2033
NSN 5910-01-107-4639
NSN 6610-01-578-7771
NSN 5910-00-566-5243
NSN 5960-01-058-8018
NSN 7035-00-500-7839
NSN 5835-01-158-6878
NSN 5925-01-326-2666
NSN 5960-00-905-5512
NSN 5895-01-612-4752
NSN 6110-00-014-8160