A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5910-01-397-5572
NSN 5960-01-317-3401
NSN 5855-00-433-2377
NSN 5920-00-391-6252
NSN 6135-00-715-4001
NSN 5965-01-552-3670
NSN 6240-01-656-4920
NSN 6650-01-363-4808
NSN 5960-00-044-6807
NSN 6645-01-060-3627
NSN 6135-01-523-3198
NSN 5920-01-222-9456