A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-315-0069
NSN 5835-01-360-0419
NSN 7035-00-803-3056
NSN 6620-01-315-2414
NSN 6135-01-627-2603
NSN 6320-00-036-3688
NSN 5996-01-005-8505
NSN 5905-01-288-3216
NSN 6650-01-438-1537
NSN 6620-01-424-6925
NSN 5950-00-645-1820
NSN 5996-00-525-1777