A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5990-01-411-5930
NSN 5985-00-837-9491
NSN 6645-01-125-6811
NSN 5990-00-581-5947
NSN 6105-01-492-6227
NSN 5855-01-057-2200
NSN 7035-01-102-5811
NSN 5835-01-397-8801
NSN 5950-00-260-5591
NSN 2925-01-633-4048
NSN 6650-01-108-6629
NSN 6150-00-299-0763