A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-505-3369
NSN 5950-00-189-1875
NSN 5895-01-141-7416
NSN 5935-01-536-5626
NSN 6130-00-410-0910
NSN 5960-01-354-0762
NSN 7035-01-143-0355
NSN 6135-01-038-6225
NSN 5999-01-199-7102
NSN 5920-00-784-5214
NSN 5990-01-548-3711
NSN 6645-01-394-1923