A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-048-7920
NSN 6110-00-323-9257
NSN 6650-01-340-8897
NSN 5996-01-171-2132
NSN 5935-01-230-5556
NSN 5950-00-215-4800
NSN 5990-00-932-3070
NSN 5905-01-374-8346
NSN 5915-00-080-8724
NSN 2925-01-103-7019
NSN 2925-00-233-5644
NSN 5930-01-643-2140