A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-00-488-4478
NSN 6620-01-596-3642
NSN 5950-01-252-8905
NSN 5920-00-489-7022
NSN 6620-00-170-5296
NSN 5935-01-061-3407
NSN 5996-01-303-6882
NSN 5935-00-388-5345
NSN 5925-00-454-9232
NSN 5930-01-100-5709
NSN 6220-01-152-7078
NSN 6220-01-644-9544