A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5975-01-508-4139
NSN 5930-01-518-0290
NSN 6150-01-271-4637
NSN 5945-01-158-1493
NSN 5935-01-369-8968
NSN 5990-01-443-2931
NSN 6220-01-211-8419
NSN 6145-01-097-4577
NSN 5990-01-259-7138
NSN 5905-01-054-1218
NSN 6620-00-785-6019
NSN 6135-00-519-1325