A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-392-4836
NSN 5990-01-303-9920
NSN 6610-01-386-4582
NSN 5905-01-441-8271
NSN 6645-01-461-1542
NSN 5910-01-069-5237
NSN 5975-00-269-4365
NSN 5920-00-014-7686
NSN 5925-01-384-3402
NSN 6150-01-630-2340
NSN 6650-01-551-1547
NSN 6150-01-321-4761