A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-01-211-6986
NSN 5930-00-499-6807
NSN 5920-00-538-0196
NSN 5925-01-123-7852
NSN 5925-01-158-9799
NSN 6620-01-512-0132
NSN 5996-00-999-1642
NSN 6110-00-900-3970
NSN 5935-00-464-9008
NSN 7035-01-033-3007
NSN 5935-00-539-9178
NSN 6645-01-500-0827