A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-00-635-8818
NSN 5895-01-288-6340
NSN 5925-00-205-2767
NSN 5985-00-633-9963
NSN 5920-00-541-1119
NSN 5925-00-925-9599
NSN 5985-01-218-5276
NSN 5998-01-384-5405
NSN 6240-00-894-4604
NSN 5935-01-412-3411
NSN 6650-00-707-1417
NSN 6650-00-918-3414