A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6110-00-389-6600
NSN 6650-01-578-0007
NSN 6620-01-026-3546
NSN 2925-01-125-9169
NSN 6610-01-250-2811
NSN 6620-01-611-5908
NSN 5930-00-233-7356
NSN 5975-00-166-5800
NSN 6135-01-481-7127
NSN 5950-00-517-8821
NSN 5855-01-577-4091
NSN 5910-01-077-9827