A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5999-01-378-1843
NSN 5965-01-008-5351
NSN 5905-01-029-4987
NSN 5895-00-484-4747
NSN 6645-01-073-5302
NSN 6645-00-936-9111
NSN 6645-01-116-9634
NSN 5985-00-169-7959
NSN 6685-00-391-8675
NSN 6220-01-258-1283
NSN 5950-00-164-0442
NSN 6135-01-142-2417