A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6320-01-006-6138
NSN 6145-01-051-9685
NSN 6110-01-594-0616
NSN 6150-01-589-6204
NSN 5960-01-262-5048
NSN 5950-00-691-3098
NSN 5915-01-412-2112
NSN 5855-01-122-3125
NSN 5895-00-356-0179
NSN 5855-01-197-2774
NSN 5920-01-553-8766
NSN 6135-01-222-0703