A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6610-01-342-2319
NSN 5855-00-688-9954
NSN 6220-01-213-3885
NSN 5905-01-420-2328
NSN 6320-01-532-7491
NSN 5999-01-526-9331
NSN 5960-01-120-6523
NSN 5855-01-222-1242
NSN 5996-01-444-1488
NSN 5835-01-231-4994
NSN 6130-01-106-8942
NSN 4140-01-244-9518