A cylindrically-shaped headed item, having circular or longitudinal groove(s).
NSN 5935-00-287-5069
NSN 5855-01-279-5316
NSN 6145-00-729-3702
NSN 5985-01-416-4961
NSN 6645-01-117-6156
NSN 6130-00-262-3385
NSN 6150-00-988-4482
NSN 5855-00-832-9341
NSN 7035-01-082-0311
NSN 6645-00-127-3835
NSN 5950-00-334-9612
NSN 5855-01-221-0355