A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5985-01-342-3452
NSN 5985-01-376-5005
NSN 5990-00-806-3556
NSN 5975-01-254-3883
NSN 6105-01-521-7420
NSN 6645-00-116-1409
NSN 6145-00-236-9504
NSN 5925-00-991-8722
NSN 5920-00-940-0270
NSN 5935-01-317-2495
NSN 5925-01-017-1036
NSN 6105-01-128-4682