A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5960-00-289-6591
NSN 5965-01-420-6613
NSN 5996-01-514-7341
NSN 5945-00-084-8410
NSN 6320-01-119-3935
NSN 5999-00-153-0917
NSN 6620-00-549-5644
NSN 5990-00-988-1690
NSN 5910-01-050-8185
NSN 5996-00-033-7777
NSN 6610-00-256-8006
NSN 6645-01-172-6838