A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6650-01-222-1749
NSN 5920-00-682-0500
NSN 6650-01-504-0956
NSN 6645-01-483-1331
NSN 5999-01-568-6884
NSN 6685-01-555-7938
NSN 6610-00-799-6971
NSN 6105-01-023-6338
NSN 6240-01-032-4237
NSN 5910-01-185-3021
NSN 6110-01-324-0021
NSN 5925-01-125-2676