A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-420-3392
NSN 5855-00-903-4305
NSN 5910-01-321-4912
NSN 6135-01-510-9986
NSN 6645-01-496-7144
NSN 6320-01-054-3046
NSN 6135-00-228-8140
NSN 5855-01-634-0259
NSN 6610-01-155-4060
NSN 5910-00-906-0175
NSN 6145-00-445-7839
NSN 7035-01-621-9471