A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6645-01-365-8020
NSN 5975-01-526-3122
NSN 5985-00-823-6302
NSN 6685-00-186-9190
NSN 5945-01-461-3060
NSN 6150-00-686-5224
NSN 5905-00-573-5690
NSN 6130-00-956-3307
NSN 6135-01-620-8216
NSN 6685-01-523-6219
NSN 6150-01-589-8375
NSN 5960-01-467-0961