A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 2925-01-464-8392
NSN 5960-00-199-6034
NSN 5945-01-113-5747
NSN 6105-01-534-5360
NSN 6620-01-137-2003
NSN 5935-00-597-2862
NSN 6610-00-509-0887
NSN 6620-00-763-2168
NSN 5925-01-473-0807
NSN 6220-01-401-5337
NSN 5895-00-089-5713
NSN 6130-01-030-9081