A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5950-01-471-6778
NSN 5895-01-192-7724
NSN 6145-00-738-5601
NSN 2925-01-196-6187
NSN 5945-01-201-8337
NSN 5925-01-604-9427
NSN 5915-01-226-5880
NSN 5990-00-147-3144
NSN 6650-01-385-9447
NSN 5999-00-186-0058
NSN 5930-00-754-3363
NSN 6150-00-051-0399