A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-00-784-0262
NSN 5910-01-088-6848
NSN 5925-01-129-6222
NSN 5895-01-277-7396
NSN 6150-01-056-7146
NSN 5950-00-646-1958
NSN 6130-00-019-3032
NSN 5945-01-146-9688
NSN 6150-00-078-7064
NSN 5965-01-258-5662
NSN 4140-01-119-2879
NSN 5985-00-862-3291