A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-00-186-0712
NSN 5920-01-173-4108
NSN 6620-01-652-4349
NSN 7035-01-200-4751
NSN 6650-01-145-5663
NSN 5965-01-510-1178
NSN 6610-00-759-7170
NSN 5965-00-267-4173
NSN 2925-01-437-9041
NSN 6320-01-428-9205
NSN 5990-01-378-7349
NSN 5905-00-011-8305