A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5855-00-433-2377
NSN 6240-01-168-3437
NSN 5960-01-493-3948
NSN 5925-00-347-0566
NSN 5925-01-359-6329
NSN 5996-01-248-0947
NSN 6145-01-535-6220
NSN 6645-00-287-9192
NSN 5935-01-127-3818
NSN 5855-01-461-8169
NSN 5855-00-231-7790
NSN 5945-01-205-7283