A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5945-01-084-6584
NSN 6110-00-227-0578
NSN 5930-00-983-2944
NSN 6220-00-933-9521
NSN 5996-01-313-7112
NSN 6645-00-521-0353
NSN 6135-01-093-7426
NSN 5925-01-234-7187
NSN 4140-00-836-6319
NSN 2925-01-567-8027
NSN 5935-01-336-9621
NSN 6645-00-472-4048