A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6135-01-236-8603
NSN 6150-01-180-6202
NSN 6150-01-571-1901
NSN 5925-01-130-3573
NSN 5910-01-605-3393
NSN 6610-01-436-3468
NSN 5915-01-563-1323
NSN 6320-01-172-6103
NSN 5895-01-330-3337
NSN 5925-01-194-1538
NSN 6645-01-377-7866
NSN 5950-01-382-7605