A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-630-3083
NSN 5855-00-221-9435
NSN 6135-01-423-7502
NSN 6105-01-559-1811
NSN 6130-01-213-0196
NSN 6320-01-519-0916
NSN 4140-00-347-6807
NSN 2925-01-279-1558
NSN 6145-00-521-0001
NSN 6150-01-070-8270
NSN 5996-00-808-5563
NSN 6240-00-519-3399