A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-00-315-7492
NSN 5910-00-655-0390
NSN 5855-01-539-4296
NSN 6240-01-645-7751
NSN 5960-01-347-6791
NSN 2925-01-510-9378
NSN 5905-00-726-9104
NSN 6145-00-563-1103
NSN 6145-00-847-5388
NSN 5895-01-571-4278
NSN 6320-01-519-8767
NSN 5910-01-075-1557