A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5930-01-425-2976
NSN 5960-01-573-6483
NSN 6220-01-229-7605
NSN 5855-01-586-9232
NSN 6240-01-052-5971
NSN 6685-01-219-4656
NSN 5910-00-922-8374
NSN 6620-00-118-8913
NSN 6610-01-040-9572
NSN 5905-01-346-5616
NSN 6220-00-225-8345
NSN 5998-00-888-9887