A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-021-1356
NSN 5915-00-974-9337
NSN 6650-01-337-9970
NSN 6645-01-430-4125
NSN 5915-01-383-8282
NSN 6150-01-128-8430
NSN 6135-00-643-4843
NSN 6135-01-609-3628
NSN 6220-01-537-7077
NSN 6135-01-504-4309
NSN 6685-01-460-5538
NSN 5935-01-113-6109