A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-603-9331
NSN 6645-01-193-9839
NSN 5905-01-633-9948
NSN 5910-01-007-5673
NSN 5950-01-422-1361
NSN 5996-00-823-8487
NSN 5990-01-288-7393
NSN 5975-01-465-9175
NSN 5835-01-566-5462
NSN 5975-01-539-1943
NSN 6110-01-080-9445
NSN 6240-01-476-1612