A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-00-646-3311
NSN 5895-00-064-1745
NSN 6130-01-208-7802
NSN 2925-00-684-7708
NSN 6645-01-554-5881
NSN 6610-01-433-2219
NSN 5965-01-542-8510
NSN 5985-01-455-7129
NSN 5915-00-244-4210
NSN 6150-01-259-0612
NSN 5835-00-602-4750
NSN 5985-01-292-1760