A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 4140-01-415-0941
NSN 5855-01-400-1590
NSN 5990-00-111-3614
NSN 5895-01-090-5407
NSN 6220-01-565-3212
NSN 5835-01-360-2657
NSN 6620-01-459-3467
NSN 5905-01-323-7019
NSN 6130-01-585-3905
NSN 5975-00-369-9721
NSN 5910-01-120-8757
NSN 5910-01-351-4669