A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6130-01-161-5890
NSN 5985-01-442-1405
NSN 5960-01-624-1170
NSN 6145-01-534-2748
NSN 6240-01-157-9128
NSN 4140-00-163-2868
NSN 5950-01-306-7931
NSN 5855-01-007-9541
NSN 2925-01-463-8856
NSN 5895-00-099-0066
NSN 6105-00-471-5545
NSN 5999-01-536-4169