A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5998-00-661-0380
NSN 5930-01-106-2966
NSN 5930-01-250-2889
NSN 5910-01-100-3390
NSN 6220-00-978-3172
NSN 5855-01-477-9629
NSN 5985-01-158-8040
NSN 6135-00-243-8330
NSN 6220-00-548-1999
NSN 5975-01-468-5411
NSN 5950-01-572-4478
NSN 6240-01-553-8992