A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5835-00-111-3419
NSN 5985-00-992-9551
NSN 6220-01-187-8932
NSN 6135-00-871-3646
NSN 7035-00-076-4097
NSN 5920-01-005-6389
NSN 5950-01-261-7938
NSN 6685-01-313-4499
NSN 5975-00-538-7957
NSN 5998-00-973-4335
NSN 6130-01-188-7411
NSN 6650-01-512-1930