A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6150-01-449-1544
NSN 6135-01-296-1860
NSN 6650-00-140-8776
NSN 5895-01-482-1403
NSN 5990-00-644-3365
NSN 5895-00-111-7014
NSN 5999-01-334-7019
NSN 5990-01-446-9118
NSN 6240-01-340-6497
NSN 6105-01-444-1201
NSN 6320-01-389-8128
NSN 6110-01-151-8110