A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5965-01-283-8821
NSN 5975-01-549-7994
NSN 6135-00-231-7257
NSN 6135-00-782-6988
NSN 6320-01-512-2031
NSN 5925-00-307-4015
NSN 6650-01-460-5837
NSN 5905-01-630-0627
NSN 6220-01-487-0914
NSN 6320-01-384-7079
NSN 5835-01-632-6627
NSN 5855-00-466-2309