A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-00-093-0130
NSN 5985-01-556-4224
NSN 6220-01-344-9707
NSN 5996-01-400-3558
NSN 6645-01-053-3185
NSN 5930-01-461-3505
NSN 5905-01-281-1506
NSN 6610-01-025-4718
NSN 5935-01-372-0246
NSN 5895-01-179-7731
NSN 7035-01-169-6551
NSN 6135-01-230-4399