A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-161-8047
NSN 5945-01-537-6186
NSN 5985-00-986-9742
NSN 6610-01-130-5101
NSN 5999-00-175-8465
NSN 5975-00-322-3712
NSN 5965-01-123-3770
NSN 5855-01-414-6265
NSN 5960-01-170-4057
NSN 7035-01-406-5232
NSN 5905-01-080-3421
NSN 6320-01-246-4390