A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6620-01-042-2046
NSN 6320-00-004-9158
NSN 6145-00-036-7085
NSN 6130-00-140-4505
NSN 5975-00-581-9862
NSN 5960-01-168-9631
NSN 6135-01-353-3802
NSN 5920-01-042-9351
NSN 6150-01-152-2413
NSN 6650-01-633-9147
NSN 5950-01-507-5183
NSN 5996-01-466-1163