A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-00-486-7907
NSN 6685-00-153-3914
NSN 5925-01-341-3159
NSN 6320-01-050-1290
NSN 5965-00-139-4870
NSN 5930-00-613-5534
NSN 5835-01-580-0446
NSN 5855-01-562-7562
NSN 6220-00-186-0177
NSN 5965-00-351-7460
NSN 5915-01-167-4739
NSN 6240-01-581-7737