A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-00-630-6154
NSN 5945-01-650-1812
NSN 5965-00-289-6280
NSN 5895-01-527-5673
NSN 5905-00-618-1611
NSN 5975-01-359-4848
NSN 5855-00-079-2370
NSN 2925-01-476-3224
NSN 6145-01-538-0991
NSN 6145-01-364-3371
NSN 5990-01-551-4356
NSN 6105-01-431-8998