A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-391-5000
NSN 5930-01-571-7004
NSN 2925-01-604-8984
NSN 5920-01-401-5315
NSN 5999-01-548-7952
NSN 5905-01-050-8400
NSN 5975-01-400-0627
NSN 5975-00-269-4365
NSN 6320-01-320-3305
NSN 5950-00-811-2410
NSN 6645-01-434-5674
NSN 6130-01-138-6082