A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5920-00-485-9170
NSN 6610-00-929-2218
NSN 6150-01-651-2968
NSN 5975-01-552-2441
NSN 6105-01-242-9592
NSN 5985-00-170-8536
NSN 6150-01-418-4196
NSN 5920-01-452-2809
NSN 6150-01-103-3010
NSN 6150-01-014-5691
NSN 5895-01-429-1255
NSN 6650-00-885-3775