A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5915-01-605-1924
NSN 5920-00-914-2707
NSN 5965-01-140-5555
NSN 6610-00-559-9552
NSN 5998-01-292-7683
NSN 6145-00-080-9913
NSN 5945-01-360-8778
NSN 2925-01-463-8856
NSN 5895-00-531-9768
NSN 5855-01-348-6690
NSN 5930-00-864-5005
NSN 5996-01-454-6938