A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-01-499-6727
NSN 5975-01-190-6917
NSN 5855-00-466-2309
NSN 5915-01-223-9374
NSN 5930-01-484-9116
NSN 5996-01-106-2763
NSN 5960-01-449-1310
NSN 6135-01-415-1163
NSN 5910-01-273-3453
NSN 2925-01-495-2690
NSN 6135-01-142-2417
NSN 5965-01-125-3830