A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6145-00-427-7201
NSN 5975-00-218-0414
NSN 4140-01-649-2817
NSN 6645-01-255-7024
NSN 5930-01-420-6529
NSN 6105-01-422-5144
NSN 2925-00-790-6949
NSN 6240-01-077-7770
NSN 6645-00-192-1152
NSN 5950-00-848-6321
NSN 6685-00-281-2840
NSN 5855-01-551-4525