A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6220-01-257-1075
NSN 5905-01-556-9079
NSN 6130-01-423-0612
NSN 5975-01-453-1985
NSN 6320-01-501-7935
NSN 5910-01-259-5539
NSN 6150-01-141-9210
NSN 6135-01-329-7994
NSN 6145-01-293-5463
NSN 5960-00-266-6741
NSN 7035-00-585-2113
NSN 5895-00-444-5937