A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-01-542-0340
NSN 6110-00-575-3437
NSN 6650-01-069-2501
NSN 6320-01-195-5583
NSN 6650-01-044-6377
NSN 5985-01-614-6740
NSN 6240-01-114-1926
NSN 5910-01-416-3409
NSN 5998-01-536-9465
NSN 6645-01-561-8760
NSN 5975-01-607-7736
NSN 5915-01-125-4173