A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-417-2423
NSN 5950-00-564-1788
NSN 5930-01-139-5153
NSN 6145-01-202-2837
NSN 5950-00-133-8953
NSN 5985-01-541-5449
NSN 6240-00-553-1923
NSN 5925-01-043-7756
NSN 6645-00-372-2618
NSN 6150-01-439-2608
NSN 5950-01-418-1787
NSN 5855-00-014-5008