A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5996-01-500-5628
NSN 7035-00-803-3056
NSN 5950-00-544-9861
NSN 5905-00-507-9663
NSN 5975-01-006-7080
NSN 5935-00-153-7930
NSN 6150-01-014-0989
NSN 5895-01-181-4324
NSN 5920-00-683-4981
NSN 6645-01-383-0106
NSN 5855-00-832-9341
NSN 5905-01-645-4813