A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-00-393-2505
NSN 5996-01-178-9486
NSN 6110-01-596-9088
NSN 5950-01-260-2382
NSN 2925-00-574-8796
NSN 5925-01-236-6722
NSN 6135-01-100-3593
NSN 5999-01-399-5174
NSN 6610-01-383-7419
NSN 6110-00-405-6217
NSN 5996-01-632-8592
NSN 4140-00-718-6352