A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 6685-00-988-4439
NSN 6610-00-290-0758
NSN 5975-01-406-6830
NSN 6320-01-532-7491
NSN 6620-01-564-9870
NSN 5950-01-327-2808
NSN 5990-01-284-1595
NSN 6610-01-632-0996
NSN 5950-00-284-7294
NSN 5985-01-563-4000
NSN 5935-01-075-6173
NSN 5930-01-386-0544