A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-485-3074
NSN 5910-01-397-1302
NSN 5950-01-432-0137
NSN 5920-00-276-8657
NSN 6135-01-348-2410
NSN 5930-01-272-3464
NSN 5985-01-232-0803
NSN 6145-01-461-1379
NSN 5945-01-607-5253
NSN 5905-00-111-3618
NSN 5960-00-161-3728
NSN 5920-01-478-3671