A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-067-4359
NSN 6220-01-134-3097
NSN 5985-01-305-8913
NSN 5950-01-184-8428
NSN 5925-01-401-5314
NSN 5975-01-523-2817
NSN 5925-01-523-2848
NSN 6645-01-140-4286
NSN 6645-01-519-3007
NSN 4140-01-072-4337
NSN 6110-00-124-8940
NSN 6240-00-383-2573