A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6240-01-463-8276
NSN 2925-01-618-2711
NSN 6610-00-401-2601
NSN 2925-01-087-4184
NSN 6240-01-163-0086
NSN 5985-00-006-9906
NSN 5975-01-589-1909
NSN 5910-01-591-3751
NSN 5950-01-287-5647
NSN 7035-00-981-7216
NSN 5945-01-350-3649
NSN 5990-00-107-0835