A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-00-890-8410
NSN 5965-01-551-4802
NSN 6620-01-029-3171
NSN 5905-01-258-6432
NSN 2925-01-604-8984
NSN 5855-01-018-1247
NSN 5998-00-992-3872
NSN 6240-01-378-2213
NSN 5975-01-449-0694
NSN 5960-00-683-7476
NSN 6145-00-286-9588
NSN 5925-00-186-8669