A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-01-470-3189
NSN 2925-00-640-8611
NSN 6105-00-171-6521
NSN 6240-01-486-8317
NSN 5945-00-573-1302
NSN 4140-01-634-0330
NSN 5910-00-228-4374
NSN 5930-01-413-2982
NSN 5905-00-203-2182
NSN 5925-00-731-7710
NSN 6620-01-528-1818
NSN 5910-01-392-1312