A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-01-293-4122
NSN 6145-01-643-0488
NSN 5975-00-400-2630
NSN 5855-01-580-0645
NSN 6645-01-624-6584
NSN 6650-00-035-9297
NSN 2925-00-928-5931
NSN 6320-01-150-5378
NSN 6130-00-589-7779
NSN 7035-01-569-6756
NSN 5925-00-290-4451
NSN 6685-01-013-8915