A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-00-162-2052
NSN 4140-01-593-3803
NSN 5935-01-413-0706
NSN 5965-01-488-6695
NSN 6240-00-262-8851
NSN 6645-00-321-6071
NSN 5930-00-948-0386
NSN 6110-00-377-9160
NSN 5855-01-606-3745
NSN 6650-01-179-3823
NSN 5985-00-161-2723
NSN 5996-00-160-1289